I offered the prayer with the Prophet, Abu Bakr and ʿUmar at Mina and it was of two rakʿat. ʿUthman in the early days of his caliphate did the same, but later on he started praying the full prayer.  

صَلَّيْتُ مَعَ النَّبِيِّ ﷺ بِمِنًى رَكْعَتَيْنِ وَأَبِي بَكْرٍ وَعُمَرَ وَمَعَ عُثْمَانَ صَدْرًا مِنْ إِمَارَتِهِ ثُمَّ أَتَمَّهَا  

Messenger of Allah ﷺ offered a two-rakʿat prayer at Mina. Abu Bakr, ʿUmar and ʿUthman, (during the early years of his caliphate) followed the same practice.  

صَلَّى رَسُولُ اللَّهِ ﷺ بِمِنًى رَكْعَتَيْنِ وَأَبُو بَكْرٍ وَعُمَرُ وَعُثْمَانُ صَدْرًا مِنْ خِلاَفَتِهِ  

"I prayed two rak'ahs with the Messenger of Allah ﷺ in Mina, and with Abu Bakr and 'Umar, and two rak'ahs with 'Uthman at the beginning of his Caliphate."  

أَنَّهُ قَالَ صَلَّيْتُ مَعَ رَسُولِ اللَّهِ ﷺ بِمِنًى وَمَعَ أَبِي بَكْرٍ وَعُمَرَ رَكْعَتَيْنِ وَمَعَ عُثْمَانَ رَكْعَتَيْنِ صَدْرًا مِنْ إِمَارَتِهِ  

I offered the prayer with the Prophet, Abu Bakr and ʿUmar at Mina and it was of two rakʿat. ʿUthman in the early days of his caliphate did the same, but later on he started praying the full prayer. (Using translation from Bukhārī 1082)  

صَلَّيْتُ مَعَ النَّبِيِّ ﷺ بِمِنًى رَكْعَتَيْنِ وَمَعَ أَبِي بَكْرٍ وَمَعَ عُمَرَ وَعُثْمَانَ صَدْرًا مِنْ إِمَارَتِهِ ثُمَّ أَتَمَّ  

[Machine] I prayed with the Prophet ﷺ in Mina two units of prayer, and with Abu Bakr, with Umar, and with Uthman, shoulder to shoulder, as part of his leadership, then I completed.  

صَلَّيْتُ مَعَ النَّبِيِّ ﷺ بِمِنًى رَكْعَتَيْنِ وَمَعَ أَبِي بَكْرٍ وَمَعَ عُمَرَ وَمَعَ عُثْمَانَ صَدْرًا مِنْ إِمَارَتِهِ ثُمَّ أَتَمَّ  

[Machine] That the Messenger of Allah ﷺ performed two units of prayer in Mina, Abu Bakr performed two units of prayer, Umar performed two units of prayer, and Uthman performed two units of prayer as well. All of this was at the beginning of his caliphate, and then he completed them afterwards.  

أَنَّ رَسُولَ اللَّهِ ﷺ صَلَّى بِمِنًى رَكْعَتَيْنِ وَأَبَا بَكْرٍ رَكْعَتَيْنِ وَعُمَرَ رَكْعَتَيْنِ وَعُثْمَانَ رَكْعَتَيْنِ صَدْرًا مِنْ إِمَارَتِهِ ثُمَّ أَتَمَّهَا بَعْدُ  

[Machine] The Messenger of Allah ﷺ performed two units of prayer and Abu Bakr, Umar, and Uthman shared the leadership with him.  

«صَلَّى رَسُولُ اللهِ ﷺ رَكْعَتَيْنِ وَأَبُو بَكْرٍ وَعُمَرُ وَعُثْمَانُ شَطْرًا مِنْ إِمَارَتِهِ»  

"I prayed two rak'ahs with the Messenger of Allah ﷺ in Mina, and with Abu Bakr and 'Umar, and two rak'ahs with 'Uthman at the beginning of his Caliphate." (Using translation from Nasāʾī 1447)  

أَنَّهُ قَالَ «صَلَّيْتُ مَعَ رَسُولِ اللهِ ﷺ بِمِنًى وَمَعَ أَبِي بَكْرٍ وَمَعَ عُمَرَ رَكْعَتَيْنِ وَمَعَ عُثْمَانَ رَكْعَتَيْنِ صَدْرًا مِنْ إِمَارَتِهِ»