Muwatta Malik #69
Purity
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ جَابِرَ بْنَ عَبْدِ اللَّهِ الأَنْصَارِيَّ، سُئِلَ عَنِ الْمَسْحِ، عَلَى الْعِمَامَةِ فَقَالَ لاَ حَتَّى يُمْسَحَ الشَّعْرُ بِالْمَاءِ .
Yahya related to me from Malik that he had heard that Jabir ibn
Abdullah al-Ansari was asked about wiping over a turban. He said, "Not
unless you have wiped over your hair with water."
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About Muwatta Malik
This hadith is #69 from Muwatta Malik, in the Book of Purity.