Alqama and I went in to see Abdullah bin Masud, and he said, "When one of you bows, let him spread his forearms along his thighs. It is as though I can still see the spaces between the fingers of the Messenger of Allah ﷺ during the prayer."
حدثنا ابن نمير حدثنا الأعمش عن إبراهيم
دخلت أنا وعلقمة على عبد الله بن مسعود فقال إذا ركع أحدكم فليفرش ذراعيه فخذيه فكأني أنظر إلى اختلاف أصابع رسول الله ﷺ في الصلاة