Ibn Umar was once in the mosque when he noticed a man dragging his garments along one side of the mosque. He said, "Look, who is that? I wish he were near me."Someone said to him, "Do you not recognize him, Abu Abdul-Rahman? That is Muhammad bin Usama."Ibn Umar lowered his head and tapped the ground with his hands, then said, "Had the Messenger of Allah ﷺ seen him, he would have loved him."
قال نظر ابن عمر يوما وهو في المسجد إلى رجل يسحب ثيابه في ناحية من المسجد، فقال: انظر من هذا؟ ليت هذا عندي، قال له إنسان: أما تعرف هذا يا أبا عبد الرحمن؟ هذا محمد بن أسامة. قال: فطأطأ ابن عمر رأسه، ونقر بيديه في الأرض، ثم قال: لو رآه رسول الله ﷺ لأحبه.
Bukhari narrated it in "The Virtues of the Companions" (3734), from Hasan bin Muhammad, who said, Abu Abbad Yahya bin Abbad narrated to us, who said, Majishun narrated to us, who said, Abdullah bin Dinar told us, and he said, then he mentioned it.