Sayyida Umm ‘Atiyyah (may Allah be pleased with her) narrates that the Prophet (peace and blessings of Allah be upon him) said: “(When giving her the ritual bath,) start with the right side and with the parts of the body washed in ablution.”
Hadith Referenceالمنتقى ابن الجارود / كتاب الجنائز / 519