Musnad Ahmad 907:114

Abdullah narrated to us, Abu Ahmad Mukhallad ibn al-Hasan—meaning Ibn Abi Zumayl—narrated to me, Ubaydullah—meaning Ibn Amr al-Raqqi—narrated to us, from Abd al-Malik—meaning Ibn Umayr—from Jabir ibn Samurah, who said: A man asked the Messenger of Allah, peace and blessings of Allah be upon him: "Should I pray in the garment in which I come to my wife?" He said: "Yes, unless you see something on it, then wash it."