Sunan Ibn Majah Book 25, Hadith 64
“The Messenger of Allah (ﷺ)
turned to face the Stone, then he put his lips on it and wept for a
long time. Then he turned and saw ‘Umar bin Khattab weeping. He
said:
‘O ‘Umar, this is the place where tears should be shed.’”
I heard Ibn ‘Abbas say: The Messenger of Allah (ﷺ) said: “This Stone will be brought on the Day of Resurrection, and it will be given two eyes with which to see, and a tongue with which to speak, and it will bear witness for those who touched it in sincerity.”
“The Messenger of Allah (ﷺ) did not touch the corners of the Ka’bah apart from the Black Corner (i.e., the corner where the Black Stone is) and the one that is next to it facing the houses of Banu Jumah (i.e., the Yemenite Corner).”