Translation:

120. All that We relate to thee of the stories of the apostles with it We make firm thy heart: in them there cometh to thee the Truth as well as an exhortation and a message of remembrance to those who believe.

Notes (Tafseer)

1624. The stories of the Prophets in the Qur-an are not mere narratives or histories: they involve three things: (1) they teach the highest spiritual Truth; (2) they give advice, direction, and warning, as to how we should govern our lives, and (3) they awaken our conscience and recall to us the working of Allah's Law in human affairs. The story of Joseph in the next Sura is an illustration in point. A) Cf. xi. 93 and vi. 135, n. 957. The worst that ye can will not defeat Allah's Plan; and as for us who believe, our obvious duty is to do our part as taught to us by Allah's revelation.