Matthew 23:18 KJV
And, Whosoever shall swear by the altar, it is nothing; but whosoever sweareth by the gift that is upon it, he is guilty.
Matthew 23:18, King James Version
In context
17 Ye fools and blind: for whether is greater, the gold, or the temple that sanctifieth the gold?
18 And, Whosoever shall swear by the altar, it is nothing; but whosoever sweareth by the gift that is upon it, he is guilty.
19 Ye fools and blind: for whether is greater, the gift, or the altar that sanctifieth the gift?