This pillar means to offer the compulsory 5 daily congregational prayers dutifully and perfectly. Salah is made to restrain us from shamelessness and evil deeds, as said in Surah Al-Anakabut.
Recite what has been revealed to you of the Book and establish prayer. Indeed, ˹genuine˺ prayer should deter ˹one˺ from indecency and wickedness. The remembrance of Allah is ˹an˺ even greater ˹deterrent˺. And Allah ˹fully˺ knows what you ˹all˺ do.