Surah al-Qiyamah (The Resurrection ) 75 : 21

Although there is no tradition to indicate its period of revelation, yet there is in the subject matter of this Surah an internal evidence, which shows that it is one of the earliest Surahs to be sent down at Makkah. After verse 15 the discourse is suddenly interrupted and the Prophet told: “Do not move your tongue to remember this Revelation hastily. It is Our responsibility to have it remembered and read. Therefore, when We are reciting it, listen to its recital carefully. Again, it is Our responsibility to explain its meaning.” Then, from verse 20 onward the same theme which was interrupted at verse 15, is resumed. This parenthetical passage, according to both the context and the traditions, has been interposed here for the reason that when the Angel Gabriel was reciting this Surah to the Prophet, the Prophet, lest he should forget its words later, was repeating them at the same moment. This in fact happened at the time when the coming down and receipt of Revelation was yet a new experience for him and he was not yet fully used to receiving it calmly. There are two other instances also of this in the Qur’an. First, in Surah 20: Ta Ha, the Prophet has been told: “And see that you do not hasten to recite the Qur’an before its revelation is completed to you.” (v. 114). Then, in Surah al-A’la, it has been said: “We shall enable you to recite:, then you shall never forget.” (v. 6). Later, when the Prophet became fully used to receiving the Revelation well, there remained no need to give him any such instruction. That is why except for these three, there is no other instance of this in the Qur’an.