That the Prophet (ﷺ) used to take him (i.e. Usama) and Al-Hassan (in his lap) and say: "O Allah! Love them, as I love them."
Sahih al-Bukhari Book 62, Hadith 82
← Previous Hadith One day Ibn `Umar, while in the Mosque, looked at a man who was dragging his clothes while walking in one of the corners of the Mosque He said, "See who is that. I wish he was near to me." Somebody then said (to Ibn `Umar), "Don't you know him, O Abu `Abdur-Rahman? He is Muhammad bin Usama." On that Ibn `Umar bowed his head and dug the earth with his hands and then, said, "If Allah's Messenger (ﷺ) saw him, he would have loved him."

Sahih al-Bukhari Book 62, Hadith 81 Next Hadith → The freed slave of Usama bin Zaid said,

"Al-Hajjaj bin Aiman bin Um Aiman and Aiman Ibn Um Aiman was Usama's brother from the maternal side, and he was one of the Ansar. He was seen by Ibn 'Umar not performing his bowing and prostrations in a perfect manner. So Ibn 'Umar told him to repeat his prayer.

Sahih al-Bukhari Book 62, Hadith 83