Matthew 5:24

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.’

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