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 23:16–20 KJV Chapter Context
16
Woe unto you, ye blind guides, which say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, he is a debtor!
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?
20
Whoso therefore shall swear by the altar, sweareth by it, and by all things thereon.