Musannaf Ibn Abi Shayba 1:812

Abu Mu'awiyah narrated to us, from Mughirah ibn Muslim, who said: I asked Ikrimah. I said to him: "Does the person in a state of major ritual impurity (junub) dip into the stagnant water?" He said: "Does it suffice him for the washing of major ritual impurity?" He said: "Yes."