Abd al-Rahman bin Abd al-Qari said that he performed tawaf of the Ka'bah with Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) after the Fajr prayer. When Sayyiduna Umar (may Allah be pleased with him) had completed his tawaf, he looked but did not see the sun, so he rode until he made his mount kneel at Dhu Tuwa, and prayed two rak'ahs.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9327