Surah Yunus, ayah 16

10:16

قُل لَّوۡ شَآءَ ٱللَّهُ مَا تَلَوۡتُهُۥ عَلَيۡكُمۡ وَلَآ أَدۡرَىٰكُم بِهِۦۖ فَقَدۡ لَبِثۡتُ فِيكُمۡ عُمُرٗا مِّن قَبۡلِهِۦٓۚ أَفَلَا تَعۡقِلُونَ ١٦

Qul law shā'allāhu mā talawtuhū 'alaykum walā adrākum bihī faqad labithtu fīkum 'umuram min qablihī afalā ta'qilūn

Say, "If Allāh had willed, I would not have recited it to you, nor would He have made it known to you, for I had remained among you a lifetime before it.516 Then will you not reason?"

Footnotes

516 The Prophet (ﷺ) lived among his people forty years before receiving any revelation.