Yahya related to me from Malik from Hisham ibn Urwa that his father said that the Messenger of Allah, may Allah bless him and grant him peace, once said to Abd ar-Rahman ibn Awf, "What do you do, Abu Muhammad, when saluting the corner?" and Abd ar-Rahman said, "Sometimes I salute it, and sometimes I don't." The Messenger of Allah, may Allah bless him and grant him peace, said, "You are right."
Muwatta Malik Book 20, Hadith 117
← Previous Hadith Yahya related to me from Malik that he had heard that when the Messenger of Allah, may Allah bless him and grant him peace, had finished his tawaf of the House, prayed two rakas, and wanted to go to Safa and Marwa, he would salute the corner of the Black Stone before he left.

Muwatta Malik Book 20, Hadith 116 Next Hadith → Yahya related to me from Malik from Hisham ibn Urwa that his father used to salute all the corners when he did tawaf of the House and did not omit the Yamani corner unless he was prevented from it.

Muwatta Malik Book 20, Hadith 118