I said, "Messenger of Allah, I have heard many hadith from you, but I forget them."The Prophet ﷺ said, "Spread out your cloak."So I spread it out, and he scooped with his hand into it, then said, "Gather it up."I gathered it up, and I never forgot a single hadith after that.
قلت: يا رسول الله! إني سمعت منك حديثا كثيرا فأنساه فقال النبي ﷺ: ابسط رداءك فبسطت فغرف بيده فيه ثم قال: ضمه، فضممت، فما نسيت حديثا بعد.