Sahih Muslim · Hadith 2120

وحدثنا يحيى بن يحيى، أخبرنا جعفر بن سليمان، عن ثابت البناني، عن أنس، قال قال أنس أصابنا ونحن مع رسول الله صلى الله عليه وسلم مطر قال فحسر رسول

Anas (b. Malik) reported: It rained upon us as we were with the Messenger of Allah (may peace be upon him). The Messenger of Allah (way peace be upon him) removed his cloth (from a part of his body) till the rain fell on it. We said: Messenger of Allah, why did you do this? He said: It is because it (the rainfall) has just come from the Exalted Lord.

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).