Matthew 23:20 teaches that when someone swears an oath by the altar, they are also swearing by everything placed on it, so the oath carries the same weight as the sacred objects it touches. Jesus says this in the middle of a sharp rebuke aimed at the scribes and Pharisees, the religious teachers of his day who had built elaborate rules about which oaths counted and which could be broken. He is speaking to his disciples and to the crowds gathered around him, showing that they had turned God’s holy things into loopholes for dodging honesty.
He therefore who swears by the altar, swears by it, and by everything on it.
Matthew 23:20 (WEB)
What Matthew 23:20 Means
The phrase “swears by the altar” refers to a common practice in Jewish life where people invoked the altar of the temple as a witness to a promise. Jesus points out that the altar is not merely a piece of stone or metal standing alone. It is the place where sacrifices are offered to God, so when you swear by it, you are calling God into the promise. To swear by the altar is therefore to swear by everything that belongs to it, including the offerings on it.
The verse does not promise that every oath is automatically binding, nor does it give a formula for making vows that count. Its purpose is to expose a hairsplitting approach that treated some oaths as weighty and others as empty. Jesus wants his listeners to see that every promise involving God’s name or sacred things is connected to God himself, and that pretending otherwise is a way of deceiving yourself and others.
The Context of Matthew 23:20
Matthew’s Gospel was written to a community with strong ties to Jewish faith and practice, and it presents Jesus as the fulfillment of God’s promises to Israel. The traditional view holds that the author was Matthew, one of the twelve disciples, though scholars often debate the exact details of authorship and date. Chapter 23 forms a sustained condemnation of religious hypocrisy, with the scribes and Pharisees repeatedly singled out for outward piety that hides an inward neglect of justice and mercy.
The verses just before and after Matthew 23:20 make the point clearer. In verses 17 through 19, Jesus mocks the logic of valuing the gold over the temple that makes it holy, and the gift over the altar that makes it holy. Verses 21 and 22 extend the same reasoning to the temple and to heaven itself, showing that every sacred place is tied to the presence of God. Read this way, Matthew 23:20 is not a standalone rule about oaths but one step in a larger argument that God’s presence fills everything that is holy.
Key Phrases in Matthew 23:20
Matthew 5:37
But let your ‘Yes’ be ‘Yes’ and your ‘No’ be ‘No.’ Whatever is more than these is of the evil one.
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In the Sermon on the Mount, Jesus gives a short and direct principle about speech that complements the warning in Matthew 23:20. Rather than multiplying oaths to prove our sincerity, he asks for plain honesty, which removes the need to hide behind elaborate promises. Reading the two passages together shows that the goal is a life where every word can be trusted.
James 5:12
But above all things, my brothers, don’t swear— not by heaven, or by the earth, or by any other oath; but let your “yes” be “yes”, and your “no”, “no”; so that you don’t fall into hypocrisy.
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James echoes the teaching on oaths and urges believers not to swear by heaven, earth, or anything else to add authority to their words. He wants their simple yes and no to be trustworthy in themselves. This letter shows the early church wrestling with the same concern about truthfulness that Jesus raised in Matthew.
A Short Prayer From Matthew 23:20
Lord, you see the places in my life where my words have not matched my intentions. I confess the times I have looked for ways around my promises and tried to make honesty optional. Make my speech simple and true, so that my yes means yes and my no means no. Help me to honor the holy things you have made and to remember that you are present in every word I give. Amen.
