“And there are some who had made a vow to Allah: “If He gives us from His bounty, we will surely spend in charity and be of the righteous.”
But when He gave them out of His bounty, they withheld it and turned away indifferently.
So He penalized them with hypocrisy in their hearts until the Day they will meet Him - because they failed Allāh in what they promised Him and because they [habitually] used to lie.”
Quran ; The Repentance 75-77