Ibn Jurayj transmitted this narration from Amr, and he said that he (peace and blessings be upon him) fell to the ground and his eyes were raised towards the sky. Then he (peace and blessings be upon him) stood up and said: "My waist-wrapper, my waist-wrapper!" Then he (peace and blessings be upon him) tied on his waist-wrapper.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3226