Sunan Abi Dawud 1962
سنن أبي داود#1962Da'ifحَدَّثَنَا هَنَّادُ بْنُ السَّرِيِّ، عَنْ أَبِي الأَحْوَصِ، عَنِ الْمُغِيرَةِ، عَنْ إِبْرَاهِيمَ، قَالَ إِنَّ عُثْمَانَ صَلَّى أَرْبَعًا لأَنَّهُ اتَّخَذَهَا وَطَنًا .
Narrated Ibrahim: Uthman prayed four rak'ahs (at Mina) for he made it his home (for settlement)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniDaif
Muhammad Muhyi Al-Din Abdul HamidDaif
Zubair Ali ZaiDaif
In-book reference: 11:242