Muwatta Malik #89
Purity
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ الصَّلْتِ بْنِ زُيَيْدٍ، أَنَّهُ قَالَ سَأَلْتُ سُلَيْمَانَ بْنَ يَسَارٍ عَنِ الْبَلَلِ، أَجِدُهُ فَقَالَ انْضَحْ مَا تَحْتَ ثَوْبِكَ بِالْمَاءِ وَالْهَ عَنْهُ .
Yahya related to me from Malik that as-Salt ibn Zuyayd said, "I
asked Sulayman ibn Yasar about a liquid I discovered. He said, 'Wash
what is under your garments with water and forget about it.' "
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About Muwatta Malik
This hadith is #89 from Muwatta Malik, in the Book of Purity.