Al-An'am - 6:105

وَكَذَلِكَ نُصَرِّفُ الآيَاتِ وَلِيَقُولُواْ دَرَسْتَ وَلِنُبَيِّنَهُ لِقَوْمٍ يَعْلَمُونَ
[6:105]
And thus do We repeat the communications and that they may say: You have read; and that We may make it clear to a people who know.
Thus do we explain the signs by various (symbols): that they may say, "Thou hast taught (us) diligently," and that We may make the matter clear to those who know.
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.