Hazrat Abdur Rahman bin Yazid narrates that Hazrat Usman performed four rak'ahs in Mina, so Hazrat Abdullah bin Mas'ud (may Allah be pleased with him) said: I performed two rak'ahs in Mina with the Holy Prophet (peace and blessings be upon him). I performed two rak'ahs in Mina with Hazrat Abu Bakr. I performed two rak'ahs in Mina with Hazrat Umar. Now your ways have become different. My wish is that out of the four, my two rak'ahs are accepted.