صحيح البخاري

Narrated `Abdullah bin Dinar:

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."