Quran 98:5 — Proof (Al-Bayyinah)

All that was asked of them was to worship GOD, devoting the religion absolutely to Him alone, observe the contact prayers (Salat), and give the obligatory charity (Zakat). Such is the perfect religion.

[98:4] In fact, those who received the scripture did not dispute until the proof was given to them.

[98:6] Those who disbelieved among the people of the scripture, and the idol worshipers, have incurred the fire of Gehenna forever. They are the worst creatures.