#28 Compulsory prayer

a man in a suit is doing a handstand on the floor
a man in a suit is doing a handstand on the floor
Two tall minarets stand against a blue sky.
Two tall minarets stand against a blue sky.

Book of Call to Prayers (Adhaan)

(38) Chapter: No Salat (prayer) (is to be offered) except the compulsory Salat after the Iqama has been pronounced for that compulsory SalatHadith 663

Narrated Malik Ibn Buhaina:

Allah's Messenger (صلى الله عليه وسلم) passed by a man praying two rak`at after the Iqama (had been pronounced). When Allah's Messenger (صلى الله عليه وسلم) completed the prayer, the people gathered around him (the Prophet) or that man and Allah's Messenger (صلى الله عليه وسلم) said to him (protesting), Are there four rak`at in Fajr prayer? Are there four rak`at in Fajr prayer?"