"Uthman prayer four (rak'ahs) in Mina until news of that reached 'Abdullah who said: 'I prayed two rak'ahs with the Messenger of Allah ﷺ.'" (Using translation from Nasāʾī 1449)
صَلَّى عُثْمَانُ بِمِنًى أَرْبَعًا حَتَّى بَلَغَ ذَلِكَ عَبْدَ اللهِ فَقَالَ «لَقَدْ صَلَّيْتُ مَعَ رَسُولِ اللهِ ﷺ رَكْعَتَيْنِ»