Al-Qiyamah 75:21

In conclusion, the passage says: اِنَّ عَلَيْنَا بَيَانَهٗ (Then, it is undertaken by Us to explain it...75:19). In other words, it is Allah's concern to explain the true message of the verses. In fact, the meaning of every single word of the Qur'an will be made plain to the Holy Prophet. He need not be concerned about it. These four verses laid down the injunctions pertaining to Qur'an and its recitation. Now the Surah reverts to its basic theme of Resurrection. It describes the conditions and horrors of the Hereafter. Here a question arises as to the contextual relationship between the four verses and the rest of the Surah where they have been studded. Before the four verses, while describing the Resurrection, it was made plain that Allah's knowledge is infinite, so much so that every man will be resurrected in the same state, the same shape and size, in which he was created the first time. His fingertips will be reconstructed with the same precision that they were created the first time; and his fingerprints will be redesigned with the same patterns of lines on their skins as were designed the before. There will be not a hair's breadth of a difference. This is possible only because Allah is Omniscient; His knowledge is infinite and all-encompassing; and His preserving capacity is incomparable, unparalleled and unique. On the basis of these attributes, the four verses were revealed to console and comfort the Holy Prophet t. The Holy Prophet is told: 'You can forget, and it is possible that you could make a mistake in transmission. But Allah is beyond these things. Allah has taken upon Himself the responsibility of storing the words of the Qur'an in your heart or explaining the message to you. Do not worry about all this. It is Our concern.' After these four verses, the Surah resumes the description of the conditions of Resurrection.