Musnad Ahmad 27:1557

Hashim ibn al-Qasim and Ishaq ibn Isa narrated to us, they said: Layth ibn Sa’d narrated to us. Hashim said: Layth narrated to us, Ibn Shihab narrated to me, from Salim, from his father, that he said: "I did not see the Messenger of Allah, may Allah bless him and grant him peace, touch anything of the House except the two Yemeni corners."