question #1 Sahih al-Bukhari 2774, Book 55, Hadith 37 : What was the significance of building a mosque upon the arrival of the Prophet in Medina?

When Allah’s Messenger (ﷺ) came to Medina, he ordered that a mosque be built. He said, “O Bani An-
Najjar! Suggest me a price for the garden of yours.” They replied, “By Allah, we will not ask its price
except from Allah.”