Surah Sad 38:17

ٱصْبِرْ عَلَىٰ مَا يَقُولُونَ وَٱذْكُرْ عَبْدَنَا دَاوُۥدَ ذَا ٱلْأَيْدِ ۖ إِنَّهُۥٓ أَوَّابٌ

Be patient over what they say and remember Our servant, David, the possessor of strength; indeed, he was one who repeatedly turned back [to Allāh].

Translation: Saheeh International

Tafsir

God exalted be He says Bear patiently what they say and remember Our servant David the one of fortitude that is to say the one of fortitude in worship he used to fast every other day and keep vigil for half the night sleep for a third and then keep vigil for the last sixth. …

Excerpt from Tafsir al-Jalalayn, commentary on 38:17, via Quran.com. The reader has the full commentary and 9 more tafsirs.