Quran 9:18 — Ultimatum (Bara'ah)

The only people to frequent GOD's masjids are those who believe in GOD and the Last Day, and observe the Contact Prayers (Salat), and give the obligatory charity (Zakat), and do not fear except GOD. These will surely be among the guided ones.

[9:17] The idol worshipers are not to frequent the masjids of GOD, while confessing their disbelief. These have nullified their works, and they will abide forever in Hell.

[9:19] Have you considered the watering of the pilgrims and caring for the Sacred Masjid a substitute for believing in GOD and the Last Day, and striving in the cause of GOD? They are not equal in the sight of GOD. GOD does not guide the wicked people.