Musnad Ahmad 33:388

Hashim and Yahya ibn Abi Bukayr narrated to us, they said: 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: "Let whoever among you wishes to pray in his place of rest, do so."