Musnad Ahmad 30:1619

A man narrated to us, and he named him, and he is Abdullah ibn Yazid, he said: Hisham narrated to us, from Muhammad ibn Sirin, from Abu Hurayrah, he said: The Messenger of Allah, may Allah bless him and grant him peace, said: "Let not one of you urinate in stagnant water, then perform ghusl (full ablution) from it."