Quran 5:57 — The Feast (Al-Ma'edah)

O you who believe, do not befriend those among the recipients of previous scripture who mock and ridicule your religion, nor shall you befriend the disbelievers. You shall reverence GOD, if you are really believers.

[5:56] Those who ally themselves with GOD and His messenger, and those who believed, belong in the party of GOD; absolutely, they are the victors.

[5:58] When you call to the Contact Prayers (Salat), they mock and ridicule it. This is because they are people who do not understand.