Matthew 23:18

again, if any one swear by the altar he is under no engagement but if he swear by the gift that is upon it, he is bound thereby.

Treasury of Scripture Knowledge

Summary

If a man sin against his neighbour, and an oath be laid upon him to make him swear, and the oath come before thine altar in this house;

The oath

Bible References

The oath

Matthew 23:18
again, if any one swear by the altar he is under no engagement but if he swear by the gift that is upon it, he is bound thereby.