Quran 6:105 Al-An'am, ayah 105 of 165

وَكَذَٰلِكَ نُصَرِّفُ ٱلْـَٔايَـٰتِ وَلِيَقُولُوا۟ دَرَسْتَ وَلِنُبَيِّنَهُۥ لِقَوْمٍ يَعْلَمُونَ ۝١٠٥

6:105 Thus do We display Our revelations that they may say (unto thee, Muhammad): "Thou hast studied," and that We may make (it) clear for people who have knowledge.