Narrated `Abdur Rahman bin Yazid: We offered a four rak`at prayer at Mina behind Ibn `Affan . `Abdullah bin Mas`ud was informed about it. He said sadly, Truly to Allah we belong and truly to Him we shall return. And added, I prayed two rak`at with Allah's Apostle at Mina and similarly with Abu Bakr and with `Umar (during their caliphates). He further said, May I be lucky enough to have two of the four rak`at accepted (by Allah).