Masjid

Masjid literally means a place where Sajdah is made. Sajdah is the posture whereby a servant prostates in front of the One who created him. In this posture, the servant places the forehead, nose, palms of the hand, knees and feet on the ground.

The posture of Sajdah is a very essential and important posture in Salah - it is so important that without it, the Salah is not valid.