Musjid-un-Nabawi was built in the time of Rasulullah (sallallahu ‘alaihi wasallam) in a very simple manner. It was extremely unique in its simplicity. The walls of the musjid were constructed from unbaked bricks, and the trunks of date palms were used as pillars. The roof was made from the leaves and branches of date palms. Whenever it rained, water would seep through into the musjid. Later on, the roof was plastered with mortar.