ٱصْبِرْ عَلَىٰ مَا يَقُولُونَ وَٱذْكُرْ عَبْدَنَا دَاوُۥدَ ذَا ٱلْأَيْدِ ۖ إِنَّهُۥٓ أَوَّابٌ
Isbir 'alaa maa yaqooloona wazkur 'abdanaa Daawooda zal aidi aidi innahooo awwaab
Be patient with what they say, and remember our servant Dawud, possessor of strength — he was ever turning back to God.
The instruction to endure is answered with a name, and Sad then spends most of its length on that name and the ones after it. Awwāb, the one who keeps returning, is the tag this surah hangs on each figure it raises — Dawud here, Sulayman, Ayyub, and even the birds gathered around Dawud two verses on. Dhā al-ayd puts strength and turning back in the same person.