Those who repent, those who worship, those who praise, those who fast, those who bow, those who prostrate, those who command the right, those who forbid the wrong, those who preserve the limits of Allah: give good news to the believers. (Surat at-Tawba, 112)
Messengers before you were also mocked, but those who jeered were engulfed by what they mocked. ( Surat al-An‘am, 10)
It has been sent down to you in the Book that when you hear Allah’s Signs being rejected and mocked at by people, you must not sit with them till they start talking of other things. If you do you are just the same as them. Allah will gather all the hypocrites and unbelievers into Hell. (Surat an-Nisa’, 140)
You who believe! Do not take as friends any of those given the Book before you or the unbelievers who make a mockery and a game out of your believe. Fear [and respect] Allah if you are believers. (Surat al-Ma’ida, 57)
... lest anyone should say, ‘Alas for me for neglecting what Allah was due, and being one of the scoffers!’ (Surat az-Zumar, 56)
When he does learn something of Our Signs, he makes a mockery of them. Such people will have a humiliating punishment. (Surat al-Jathiyya, 9)