Bakkar bin Yahya narrates from his grandmother, who said: I went to Sayyidah Umm Salamah (may Allah be pleased with her); then she narrated a long hadith. Sayyidah Umm Salamah (may Allah be pleased with her) said: "When one of us took the ritual bath while her hair was combed (and plaited), she would not undo it, but would pour three handfuls of water over her head. When she saw the moisture at the roots of the hair, she would rub it, then pour water over the rest of her body."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 861