Musnad Abu Ya'la al-Mawsili 2:79

Abu Khaythama narrated to us, Waki' narrated to us, from Sufyan, from Ibrahim ibn 'Abd al-A'la, from Suwayd ibn Ghafala: That 'Umar kissed it—meaning the Black Stone—and embraced it, and said: "I saw Abu al-Qasim (may Allah bless him and grant him peace) being affectionate toward you."