Musnad Ahmad 33:1163

Yahya ibn Abi Bukayr narrated to us, Zuhayr narrated to us, Abu al-Zubayr narrated to us, from Jabir, who said: We went out with the Messenger of Allah, may Allah bless him and grant him peace, on a journey, and it rained upon us. He said: "Whoever among you wishes, let him pray in his place of lodging."