Surah az-Zumar (The Groups) 39 : 18

In Ayat 10 (…and the earth of God is spacious…) there is abundant evidence that this Surah was sent down before the migration to Abyssinia. Some hadith provide the explanation that this verse was sent down in respect of Ja’far bin Abi Talib and his companions when they made up their mind to emigrate to Abyssinia.

قُلْ يَا عِبَادِ الَّذِينَ آمَنُوا اتَّقُوا رَبَّكُمْ ۚ لِلَّذِينَ أَحْسَنُوا فِي هَـٰذِهِ الدُّنْيَا حَسَنَةٌ ۗ وَأَرْضُ اللَّـهِ وَاسِعَةٌ ۗ إِنَّمَا يُوَفَّى الصَّابِرُونَ أَجْرَهُم بِغَيْرِ حِسَابٍ  "Say, "O My servants who have believed, fear your Lord. For those who do good in this world is good, and the earth of Allah is spacious. Indeed, the patient will be given their reward without account." (39:10) 

In Surah al-Ankabut (29) -  there is a similar Ayat, يَا عِبَادِيَ الَّذِينَ آمَنُوا إِنَّ أَرْضِي وَاسِعَةٌ فَإِيَّايَ فَاعْبُدُونِ "O My servants who have believed, indeed My earth is spacious, so worship only Me." (29:56)

The entire Surah is a most eloquent and effective address which was given some time before the emigration to Abyssinia, in an environment filled with tyranny and persecution, ill-will and antagonism, at Makkah. It is a sermon whose addresses mainly are the unbelieving Quraysh, although here and there the believers also have been addressed. In it the real aim of the invitation of Muhammad is this: Man should adopt God’s servitude sincerely, and should not pollute his worship with the service of any other. Presenting this cardinal principle in different ways over and over again, the truth of Monotheism (Tawhid) and the excellent results of accepting it, and the falsehood of polytheism (shirk) and the evil consequences of following it, have been explained in a most forceful way, and the people exhorted to give up their wrong way of life and return to the mercy of their Lord. In this very connection, the believers have been instructed, as if to say: “If a place has become narrow for the worship and service of God, His earth is vast: you may emigrate to some other place in order to save your faith: God will reward you for your patience.” On the other hand, the Prophet has been encouraged, so as to say: “Tell the disbelievers plainly that they may do whatever they like, but their persecutions and tyrannies will never deter you from the way of Islam; that they may go on doing their utmost to obstruct your way, but you will continue to perform your mission in spite of the adverse conditions and circumstances.”