Yahya related the same as that to me from Malik from Zayd ibn Aslam from his father from Umar ibn al-Khattab.
Muwatta Malik Book 9, Hadith 23
← Previous Hadith Yahya related to me from Malik from Ibn Shihab from Salim ibn Abdullah from his father that Umar ibn al-Khattab, when he went to Makka, used to lead them in prayer and do two rakas and then say, "People of Makka,complete the prayer, we are a group travelling."

Muwatta Malik Book 9, Hadith 22 Next Hadith → Yahya related to me from Malik from Nafi that Abdullah ibn Umar used to pray four rakas behind the imam at Mina, and when he prayed by himself he would pray two rakas.

Muwatta Malik Book 9, Hadith 24