question #1 Sahih Muslim 939f, Book 11, Hadith 51 : What is the significance of washing the deceased an odd number of times in Islamic funeral rites?

When Zainab the daughter of the Messenger of Allah (ﷺ) died, he said to us: Wash her odd number of times, i. e. three or five times, and put camphor or something-like camphor at the fifth time, and after you have washed her inform me. So we informed him and he gave us his under-garment, saying:” Put it next her body.”