Islamic Studies
The Five Pillars of Islam – First Pillar: Shahadah (Kalimah Tayyibah)
Which of the following is a PILLAR (Rukn) of Salah — if missed, the prayer is completely invalid?
Explanation
Prostration (Sajdah) with seven body parts (forehead, nose, palms, knees, toes) is a Pillar (Rukn) of Salah. If missed deliberately, the entire prayer is invalid. Options A, B, D are not pillars.
Reference: Five Pillars of Islam Notes
, Page 2