وَلَقَدْ أَرْسَلْنَا نُوحًا وَإِبْرَٰهِيمَ وَجَعَلْنَا فِى ذُرِّيَّتِهِمَا ٱلنُّبُوَّةَ وَٱلْكِتَـٰبَ ۖ فَمِنْهُم مُّهْتَدٍ ۖ وَكَثِيرٌ مِّنْهُمْ فَـٰسِقُونَ Qur’an Al-Hadid (57:26)Walaqad arsalna noohan waibraheema wajaAAalna fee thurriyyatihima alnnubuwwata waalkitaba faminhum muhtadin wakatheerun minhum fasiqoona
I.e., to give man a balance wherewith to weigh right and wrong, and so to enable him to behave with equity (see preceding verse).
Some of them: i.e., of their line, or posterity, or Ummat. When the Book that was given to them became corrupted, many of them followed their own fancies and became transgressors.