Muwatta Malik #118
Purity
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ لاَ بَأْسَ أَنْ يُغْتَسَلَ بِفَضْلِ الْمَرْأَةِ مَا لَمْ تَكُنْ حَائِضًا أَوْ جُنُبًا .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar
used to say, "There is no harm in doing ghusl with water that has been
used by one's wife as long as she is not menstruating or in a state of
major ritual impurity (junub)."
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About Muwatta Malik
This hadith is #118 from Muwatta Malik, in the Book of Purity.