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  

The Prophet ﷺ I led us in the prayer at Mina during the peace period by offering two rakʿat.  

صَلَّى بِنَا النَّبِيُّ ﷺ آمَنَ مَا كَانَ بِمِنًى رَكْعَتَيْنِ  

We offered a four rakʿat prayer at Mina behind Ibn ʿAffan . ʿAbdullah bin Masʿud was informed about it. He said sadly, "Truly to Allah we belong and truly to Him we shall return." And added, "I prayed two rakʿat with Messenger of Allah ﷺ at Mina and similarly with Abu Bakr and with ʿUmar (during their caliphates)." He further said, "May I be lucky enough to have two of the four rakʿat accepted (by Allah)."  

صَلَّيْتُ مَعَ رَسُولِ اللَّهِ ﷺ بِمِنًى رَكْعَتَيْنِ وَصَلَّيْتُ مَعَ أَبِي بَكْرٍ ؓ بِمِنًى رَكْعَتَيْنِ وَصَلَّيْتُ مَعَ عُمَرَ بْنِ الْخَطَّابِ ؓ بِمِنًى رَكْعَتَيْنِ فَلَيْتَ حَظِّي مِنْ أَرْبَعِ رَكَعَاتٍ رَكْعَتَانِ مُتَقَبَّلَتَانِ