Musnad Ahmad 26:403

Rawh and Muhammad ibn Ja'far narrated to us, they said: Shu'bah narrated to us, from Sulayman, he said: I heard 'Umarah ibn 'Umayr narrating—Ibn Ja'far said: Or Ibrahim, Shu'bah was uncertain—from 'Abd al-Rahman ibn Yazid, from 'Abdullah ibn Mas'ud, he said: "I prayed with the Messenger of Allah, peace and blessings of Allah be upon him, at Mina two rak'ahs, and with Abu Bakr, may Allah be pleased with him, two rak'ahs, and with 'Umar, may Allah be pleased with him, two rak'ahs. Would that my share of the four were two accepted rak'ahs."