Umm Atiyyah (may Allah be pleased with her) says that one of the daughters of the Messenger of Allah (peace and blessings be upon him) passed away, and he (peace and blessings be upon him) said: "Wash her three or five times, or more than that if you see the need. Wash her with water and lote-tree leaves, and in the last washing put camphor, or some camphor; and when you have finished, tell me." So when we had finished, we informed him (peace and blessings be upon him), and he (peace and blessings be upon him) gave us a waist-wrapper. He (peace and blessings be upon him) further said: "Wrap her in it next to her body", and he also said: "Three, five or seven times, or even more than that if you see the need." She says: And we made her hair into three plaits.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6633