Ezekiel 25:17

"The path of the righteous man is beset on all sides with the iniquities of the selfish and the tyranny of evil men. Blessed is he who in the name of charity and good will shepherds the weak through the valley of darkness, for he is truly his brother's keeper and the finder of lost children. And I will strike down upon those with great vengeance and with furious anger those who attempt to poison and destroy my brothers. And you will know that my name is the Lord when I lay my vengeance upon thee."

As quoted by Samuel L Jackson playing Jules in Pulp Fiction.

What the actual Bible passage says is this:

"And I will execute great vengeance upon them with furious rebukes; and they shall know that I am the Lord, when I shall lay my vengeance upon them."