Abu Ayyub al-Ansari · The Book of Purification and its Sunnah

Abu Sa'ib, the freed slave of Hisham bin Zuhrah, told him that he heard Abu Hurairah say: "The Messenger of Allah said: 'No one of you should bathe in standing water when he is sexually impure.'" He (Abu Sa'ib) said: "What should he do, O Abu Hurairah?" He said: "Let him take some out (and pour it over himself)."

"The Messenger of Allah set the time for postnatal bleeding at forty days, except for one who becomes pure before that."