Surah al-Baqarah (The Cow) 2 : 84

• وَإِذْ قَالَ رَبُّكَ لِلْمَلَائِكَةِ إِنِّي جَاعِلٌ فِي الْأَرْضِ خَلِيفَةً ۖ قَالُوا أَتَجْعَلُ فِيهَا مَن يُفْسِدُ فِيهَا وَيَسْفِكُ الدِّمَاءَ وَنَحْنُ نُسَبِّحُ بِحَمْدِكَ وَنُقَدِّسُ لَكَ ۖ قَالَ إِنِّي أَعْلَمُ مَا لَا تَعْلَمُونَ
  
  And [mention, O Muhammad], when your Lord said to the angels, "Indeed, I will make upon the earth a successive authority." They said, "Will You place upon it one who causes corruption therein and sheds blood, while we declare Your praise and sanctify You?" Allah said, "Indeed, I know that which you do not know." (2:30)
   
• وَلَقَدْ أَخَذَ اللَّـهُ مِيثَاقَ بَنِي إِسْرَائِيلَ وَبَعَثْنَا مِنْهُمُ اثْنَيْ عَشَرَ نَقِيبًا ۖ وَقَالَ اللَّـهُ إِنِّي مَعَكُمْ ۖ لَئِنْ أَقَمْتُمُ الصَّلَاةَ وَآتَيْتُمُ الزَّكَاةَ وَآمَنتُم بِرُسُلِي وَعَزَّرْتُمُوهُمْ وَأَقْرَضْتُمُ اللَّـهَ قَرْضًا حَسَنًا لَّأُكَفِّرَنَّ عَنكُمْ سَيِّئَاتِكُمْ وَلَأُدْخِلَنَّكُمْ جَنَّاتٍ تَجْرِي مِن تَحْتِهَا الْأَنْهَارُ ۚ فَمَن كَفَرَ بَعْدَ ذَٰلِكَ مِنكُمْ فَقَدْ ضَلَّ سَوَاءَ السَّبِيلِ
  
  "And Allah had already taken a covenant from the Children of Israel, and We delegated from among them twelve leaders. And Allah said, "I am with you. If you establish prayer and give zakah and believe in My messengers and support them and loan Allah a goodly loan, I will surely remove from you your misdeeds and admit you to gardens beneath which rivers flow. But whoever of you disbelieves after that has certainly strayed from the soundness of the way." (5:12)

The scholars are unanimous that Surah al-Baqarah is Madani and that it was the first Surah revealed in Madinah. [Ibn Hajar al-Asqalani in Fath al-Bari no. 160/8].

Despite it being the first Surah to be revealed in Madinah, it contains Ayaat from a later period also. In fact, according to Ibn Abbas [as mentioned in Ibn Kathir] the last Ayat revealed to the Prophet was Ayat no. 281 from Surah al-Baqarah and this occurred 8 days or so before his death [which corresponds to the year 11 Hijri].

In order to understand the meaning of this Surah, we should know its historical background:

1. At Makkah, the Quran generally addressed the polytheist Quraysh who were ignorant of Islam, but at Madinah it was also concerned with the Jews who were acquainted with the creed of Monotheism, Prophethood, Revelation, the Hereafter and Angels. They also professed to believe in the law which was revealed by God to their Prophet Moses, and in principle, their way was the same (Islam) that was being taught by Prophet Muhammad. But they had strayed away from it during the centuries of degeneration and had adopted many un-Islamic creeds, rites and customs of which there was no mention and for which there was no sanction in the Torah. Not only this: they had tampered with the Torah by inserting their own explanations and interpretations into its text. They had distorted even that part of the Word of God which had remained intact in their Scriptures and taken out of it the real spirit of true religion and were now clinging to a lifeless frame of rituals. Consequently their beliefs, their morals and their conduct had gone to the lowest depths of degeneration. The pity is that they were not only satisfied with their condition but loved to cling to it. Besides this, they had no intention or inclination to accept any kind of reform. So they became bitter enemies of those who came to teach them the Right Way and did their utmost to defeat every such effort. Though they were originally Muslims, they had swerved from the real Islam and made innovations and alterations in it and had fallen victims to hair splitting and sectarianism. They had forgotten and forsaken God and begun to serve material wealth. So much so that they had even given up their original name “Muslim” and adopted the name “Jew” instead, and made religion the sole monopoly of the children of Israel. This was their religious condition when the Prophet went to Madinah and invited the Jews to the true religion. That is why more than one third of this Surah has been addressed to the children of Israel. A critical review of their history, their moral degeneration and their religious perversions has been made. Side by side with this, the high standard of morality and the fundamental principles of the pure religion have been put forward in order to bring out clearly the nature of the degeneration of the community of a prophet when it goes astray and to draw clear lines of demarcation between real piety and formalism, and the essentials and non-essentials of the true religion.

2. At Makkah, Islam was mainly concerned with the propagation of its fundamental principles and the moral training of its followers. But after the migration of the Prophet to Madinah, where Muslims had come to settle from all over Arabia and where a tiny Islamic State had been set up with the help of the ‘local supporters’ (Ansar), naturally the Quran had to turn its attention to the social, cultural, economic, political and legal problems as well. This accounts for the difference between the themes of the Surahs revealed at Makkah and those at Madinah. Accordingly about half of this Surah deals with those principles and regulations which are essential for the integration and solidarity of a community and for the solution of its problems.

After the migration to Madinah, the struggle between Islam and disbelief (Kufr) had also entered a new phase. Before this the Believers, who propagated Islam among their own clans and tribes, had to face its opponents at their own risk. But the conditions had changed at Madinah, where Muslims from all parts of Arabia had come and settled as one community, and had established an independent city state. Here it became a struggle for the survival of the Community itself, for the whole of non-Muslim Arabia was bent upon and united in crushing it totally. Hence the following instructions, upon which depended not only its success but its very survival, were revealed in this Surah:

a. The Community should work with the utmost zeal to propagate its ideology and win over to its side the greatest possible number of people.

b. It should so expose its opponents as to leave no room for doubt in the mind of any sensible person that they were adhering to an absolutely wrong position.

c. It should infuse in its members (the majority of whom were homeless and indigent and surrounded on all sides by enemies) that courage and fortitude which is so indispensable to their very existence in the adverse circumstances in which they were struggling and to prepare them to face these boldly.

d. It should also keep them ready and prepared to meet any armed menace, which might come from any side to suppress and crush their ideology, and to oppose it tooth and nail without minding the overwhelming numerical strength and the material resources of its enemies.

e. It should also create in them that courage which is needed for the eradication of evil ways and for the establishment of the Islamic Way instead. That is why God has revealed in this Surah such instructions as may help achieve all the above mentioned objects.

At the time of the revelation of Al-Baqarah, all sorts of hypocrites had begun to appear. God has, therefore, briefly pointed out their characteristics here. Afterwards when their evil characteristics and mischievous deeds became manifest, God sent detailed instructions about them. [REF: Mawdudi]

• Murder is amongst the Major sins.  Narrated `Abdullah: Allah's Messenger (ﷺ) said, "Whenever a person is murdered unjustly, there is a share from the burden of the crime on the first son of Adam for he was the first to start the tradition of murdering."
  
  حَدَّثَنَا عُمَرُ بْنُ حَفْصِ بْنِ غِيَاثٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، قَالَ حَدَّثَنِي عَبْدُ اللَّهِ بْنُ مُرَّةَ، عَنْ مَسْرُوقٍ، عَنْ عَبْدِ اللَّهِ ـ رضى الله عنه ـ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ لاَ تُقْتَلُ نَفْسٌ ظُلْمًا إِلاَّ كَانَ عَلَى ابْنِ آدَمَ الأَوَّلِ كِفْلٌ مِنْ دَمِهَا، لأَنَّهُ أَوَّلُ مَنْ سَنَّ الْقَتْلَ ‏"‏‏.‏
  Sahih al-Bukhari 3335
   
• The Messenger of Allah is reported to have said, مَثَلُ الْمُؤْمِنِينَ فِي تَوَادِّهِمْ وَتَرَاحُمِهِمْ وَتَوَاصُلِهِمْ بِمَنْزِلَةِ الْجَسَدِ الْوَاحِدِ إِذَا اشْتَكى مِنْهُ عُضْوٌ تَدَاعَى لَهُ سَائِرُ الْجَسَدِ بِالْحُمَّى وَالسَّهَر "The example of the believers in their kindness, mercy and sympathy to each other is the example of one body, when an organ of it falls ill, the rest of the body rushes to its aid in fever and sleeplessness" Sahih Muslim