49:11
O you who believe! (Let) not ridicule a people [of] (another) people, perhaps that they maybe better than them; and (let) not women [of] (other) women perhaps that they maybe better than them. And (do) not insult yourselves and (do) not call each other by nicknames. Wretched is the name (of) disobedience after the faith. And whoever (does) not repent, then those - they (are) the wrongdoers.

104:1
Woe to every slanderer backbiter!

9:58
And among them (is he) who criticizes you concerning the charities. Then if they are given from it, they are pleased; but if not they are given from it, then they (are) enraged.

9:79
Those who criticize the ones who give willingly of the believers concerning the charities, and those who not find except their effort, so they ridicule them, will ridicule Allah them, and for them (is) a punishment painful.