question #1 Sahih Muslim 973b, Book 11, Hadith 129 : What is the significance of offering funeral prayers in a mosque according to Islamic tradition?

How hastily the people criticise that about which they know little. They criticise us for carrying the bier in the mosque. The Messenger of Allah (ﷺ) offered not the funeral prayer of Suhail b. Baida’ but in the innermost part of the mosque.