Yusuf 12:111

Laqad kana fee qasasihimAAibratun li-olee al-albabi ma kana hadeethanyuftara walakin tasdeeqa allatheebayna yadayhi watafseela kulli shay-in wahudan warahmatanliqawmin yu/minoon

There was certainly in their stories a lesson for those of understanding. Never was it [i.e., the Qur’ān] a narration invented, but a confirmation of what was before it and a detailed explanation of all things and guidance and mercy for a people who believe.

Surely, in the narratives of these, there is a lesson for the people of understanding. It is not an invented story, rather, a confirmation of what has been before it, and an elaboration of everything, and guidance and mercy for a people who believe.