While he was walking with his lower garment trailing on the ground, the Messenger of Allah ﷺ caught up with him, having taken hold of his own forelock and saying, "O Allah, Your servant, son of Your servant, son of Your maidservant."Amr said, "I said, 'Messenger of Allah, I am a man with thin legs.'"He replied, "Amr, Allah has perfected the creation of every thing. Amr..." Then the Messenger of Allah ﷺ struck four fingers of his right hand below Amr's knee and said, "Amr, this is where the lower garment should reach." Then he raised them and placed them below the next position and said, "Amr, this is where the lower garment should reach."
حدثنا الوليد بن مسلم حدثنا الوليد بن سليمان أن القاسم بن عبد الرحمن حدثهم
بينا هو يمشي قد أسبل إزاره إذ لحقه رسول الله ﷺ وقد أخذ بناصية نفسه وهو يقول اللهم عبدك ابن عبدك ابن أمتك قال عمرو فقلت يا رسول الله إني رجل حمش الساقين فقال يا عمرو إن الله عز وجل قد أحسن كل شيء خلقه يا عمرو وضرب رسول الله ﷺ بأربع أصابع من كفه اليمنى تحت ركبة عمرو فقال يا عمرو هذا موضع الإزار ثم رفعها ثم وضعها تحت الثانية فقال يا عمرو هذا موضع الإزار
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Its isnad is sahih. Walid explicitly stated that he heard directly, and Walid bin Sulayman Qurashi is a well-known trustworthy narrator, as is Qasim bin Abdul-Rahman. The hadith was narrated in similar wording by Tirmidhi (4/247, no. 1783) from Huzaifa with a similar account, and likewise by Ibn Majah (2/1182, no. 3572), and by Tabarani in al-Saghir (1/97). Haythami said (5/23), "The men of Ahmad's narration are trustworthy."