Sahih Bukhari

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