Swear: Promises, Oaths and Offensive Language
The word “swear” carries two very different meanings: to make a binding promise or oath, and to use offensive language. Scripture speaks into both — the sacred weight of a promise kept, and the careless words we let slip in anger.
1/. The Weight of a Promise
To make a solemn statement undertaking to do something, or affirming the truth of something. A sworn word is a binding oath or vow — such as swearing on the Bible to ‘tell the truth, the whole truth, and nothing but the truth’. In Bible times, this solemn declaration invoked deity, or a sacred person, to confirm the honesty and truth of what was said, placing the speaker’s integrity under God’s own witness.
Do I honour my commitments?
A person of character honours their word, fulfilling what they said they would do. God is not a man that He should lie — He does what He says (Num 23:19).
God made a promise to Abraham and gave His solemn pledge that it would come to pass (Heb 6:13). Because God cannot lie, His oath is the ultimate standard: when God swears, it is certain. Jesus said that when we say we will do something, our word should be enough. We do not need to add any binding vow to it — which we can’t substantiate anyway; such hollow claims come from Satan (Mt 5:33-37). A follower of Christ is known for keeping promises, not decorating them.
See also: commitment, promise, vow.
2/. Offensive Language
This includes abusive, violent, foul-mouthed and blasphemous language expressed when frustrated or angry. Nothing is gained by using such vulgar emphases; they do not strengthen an argument, they simply reveal the state of the heart. This form of swearing often ‘takes the Lord’s name in vain’, and the Bible declares the speaker will be held guilty for misusing His name (Ex 20:7).
Do I need to correct my speaking habits?
God is to be respected and worshipped, not belittled and cursed. Rather than tearing down with crude words, Scripture directs us upward: “Let no unwholesome words come out of your mouths, but only what is helpful for building others up…” (Eph 4:29, 5:3-4). Remember that we will give account of our words (Mt 12:36).
See also: foul language, profanity, tongue, words.
Reflection and Application
- Before making a promise, count the cost — then keep every commitment you make.
- Let your simple “yes” and “no” be trustworthy, without extra oaths or exaggeration.
- Refuse to use God’s name, or coarse language, to add force to your words.
- Ask each day whether your speech built others up or tore them down.