4427 The Israelites corrupted or lost their Book: they disobeyed Allah's Law; and failed to proclaim and exemplify Allah's Message. That is why the new Revelation came to the Prophet. If, in the beginning, it was rejected and persecuted, there was no cause for discouragement; on the contrary, there was all the greater need for patience and perseverance.
4428 Every mortal according to his nature and degree of spiritual enlightenment falls short of the perfect standard of Allah (16:61), and should therefore ask Allah for forgiveness. What is merit in an ordinary man may be a human shortcoming in one nearest to Allah: see 38:24-25, and notes 4175-4176. Prophets have a further responsibility for their People or their Ummah, and they ask in a representative capacity.
4429 Cf. 3:41 . Evening and morning are the best times for contemplation and spiritual effort. But the phrase "evening and morning" may mean "at all times". (R).
9 Like other prophets, Muḥammad (ﷺ) was infallible of sin. The verse here refers to misjudgments, such as the Prophet’s response to the blind man (80:1-10), Jonah’s departure from his city without Allah’s permission (21:87-88), and David’s suspicions of the two men who scaled the wall of his sanctuary (38:21-25). If the Prophet (ﷺ) himself is urged to seek forgiveness, then the believers are even more in need of praying for Allah’s forgiveness.