Matthew 5:23-24

5:23 So then, if you bring your gift to the altar and there remember that your brother has something against you, 5:24 leave your gift there in front of the altar. First go and be reconciled to your brother and then come and present your gift.

Matthew 23:18

23:18 And, ‘Whoever swears by the altar is bound by nothing. ¹  But if anyone swears by the gift on it he is bound by the oath.’

¹ tn Grk “Whoever swears by the altar, it is nothing.”