فَٱصْبِرْ إِنَّ وَعْدَ ٱللَّهِ حَقٌّ وَٱسْتَغْفِرْ لِذَنۢبِكَ وَسَبِّحْ بِحَمْدِ رَبِّكَ بِٱلْعَشِىِّ وَٱلْإِبْكَـٰرِ
Asad Quran Translation
hence, remain thou patient in adversity - for, verily, God's promise always comes true - and ask forgiveness for thy sins, and extol thy Sustainer's glory and praise by night and by day.38
According to all classical commentators, the above passage is addressed in the first instance to the Prophet and, through him, to every believer. As regards the Prophet himself, see note  on the last sentence of 24:31 .
Malik Quran Translation
So be patient, the promise of Allah is true. Implore forgiveness for your sins and celebrate the praises of your Rabb evening and morning.
Yusuf Ali Quran Translation
Patiently then persevere: for the Promise of Allah is true: and ask forgiveness for thy fault and celebrate the Praises of thy Lord in the evening and in the morning. 4427 4428 4429
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 holy 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.
Every mortal according to his nature and degree of spiritual enlightenment falls short of the perfect standard of Allah (xvi. 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 xxxviii. 24-25, and notes 4175-76. Prophets have a further responsibility for their People or their Ummat, and they ask in a representative capacity.
Cf. iii. 41. Evening and morning are the best times for contemplation and prayer. But the phrase "evening and morning" may mean "at all times".
Mustafa Khattab Quran Translation
So be patient ˹O Prophet˺, ˹for˺ Allah’s promise is certainly true. Seek forgiveness for your shortcomings.1
And glorify the praises of your Lord morning and evening.
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.
Piktal Quran Translation
Then have patience (O Muhammad). Lo! the promise of Allah is true. And ask forgiveness of thy sin, and hymn the praise of thy Lord at fall of night and in the early hours.
Faisbir inna waAAda Allahi haqqun waistaghfir lithanbika wasabbih bihamdi rabbika bialAAashiyyi waalibkari