Indeed, it is We who have sent down to you, [O Muhammad], (76:23)

Almuntakhab Fi Tafsir Alquran Alkarim

We are revealing to you the Quran in successive stages to be impressed upon your heart, and your effort be imprinted by the Divine hand

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(76:23) (O Prophet), indeed We have revealed the Qur'an to you in portions. *27

Indeed, it is We who have sent down to you, [O Muhammad], meaning

*27) Though the addressee here apparently is the Holy Prophet (upon whom be peace), the discourse is directed to the disbelievers, who said "Muhammad (upon whom be Allah's peace and blessings) himself composes the Qur'an deliberately piece by piece; had it been from Allah, it would be revealed all at once. At some places on the Qur'an this objection bas been cited and answered (e.g. see E.N.'s 102, 104, 105, 106 of An-Nahl and E.N. 119 of Bani Isra'il), but here Allah has answered it without citing it, saying emphatically: "It is We Ourself Who are sending it down: it is not the composition of Muhammad: and it is We Ourself Who are sending it gradually. That is, it is the requirement of Our wisdom that We should not send down Our message all together in book form, but should send it piece by piece."
 

Indeed, it is We who have sent down to you, [O Muhammad], meaning in Urdu

اے نبیؐ، ہم نے ہی تم پر یہ قرآن تھوڑا تھوڑا کر کے نازل کیا ہے