Musannaf Ibn Abi Shayba 8:618

Abu Bakr narrated to us, he said: Abd al-A’la ibn Abd al-A’la narrated to us, from Hisham, from ‘Ata, who said: Al-Miswar ibn Makhrama used to perform Tawaf in the morning for three weeks (circuits). When the sun rose, he would pray two rak'ahs for every week (circuit). He would do the same after the Asr prayer. And when the sun set, he would pray two rak'ahs for every week (circuit).