Who not performing namaz(prayer)

Namaz na Parhne ka Azab

There fifteen punishment for not pray namaz. Six in the world, three at the time of death, three in Qabar and three also in Qabar. Read in detail in Roman Urdu.
Islam considers Namaz a fundamental pillar of faith and neglecting it is considered a serious offense.
While there is no physical punishment in the world for not praying, Islamic teachings emphasize the importance of accountability to Allah SWT for one's actions.