Do not forestall (the revelation before its completion) by acting in haste.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (stir not thy tongue) to read the qur'an, o muhammad, (herewith to hasten it) to hasten the recitation of the qur'an before gabriel finishes reciting it to you. this is because the prophet (pbuh) used to repeat whatever revelations of the qur'an gabriel brought down to him before the latter finished a sentence of the qur'an, out of fear of forgetting what was revealed to him. allah warned him against doing so.
Jalāl al-Dīn al-Maḥallī
تفسير : god, exalted be he, says to his prophet: do not move your tongue with it, with the qur’ān, before gabriel is through with [reciting] it, to hasten it, fearing to lose it.
