Reference in Quran:
47:38: " Behold! you are those who are called to spend in Allah’s way; but among you are those who are niggardly; and whoever is niggardly, is niggardly against his own soul. And Allah is Self-Sufficient and you are needy. And if you turn back He will bring in your place another people, then they will not be like you. "
57:24: " Such as are niggardly and enjoin niggardliness on men. And whoever turns back, then surely Allah is the Self-Sufficient , the Praised. "
22:64: " To Him belongs all that is in the heavens and all that is on the earth. And verily, Allah He is Rich (Free of all wants), Worthy of all praise. "