Our Saviour here evidently had no reference to judicial oaths, or oaths taken in a court of justice. It was merely the foolish and wicked habit of swearing in private conversation; of swearing on every occasion and by everything that he condemned. This he does condemn in a most unqualified manner. He himself, however, did not refuse to take an oath in a court of law, Mat 26:63-64. So Paul often called God to witness his sincerity, which is all that is meant by an oath. See Rom 1:9; Rom 9:1; Gal 1:20; Heb 6:16. Oaths were, moreover, prescribed in the law of Moses, and Christ did not come to repeal those laws. See Exo 22:11; Lev 5:1; 5:19; Deu 29:12, Deu 29:14.[9]
God is the Being by which we must swear. The Lord Jesus is not doing away with swearing and taking oaths, but He is doing away with Jewish hypocrisy and false teaching concerning the Third Commandment. The Jews “avoided of God’s personal name and instead used reverent substitutions, clever liars could take an oath that seemed to appeal to God without technically doing so (23:16-22).”[10] Therefore, we see here our Lord a clear understanding of the Third Commandment and exposing the hypocrisy of the Jews and the taking of God’s Name in vain. Furthermore, swearing by other things than God “would indicate idolatry, or apostasy, which the passage from Jeremiah (mentioned above concerning lust [Jer. 5:7-9]) also conveys.”[11] The Lord Jesus did not do away with oaths, but showed their real intent and exposed false and sinful use of oaths. The Lord’s brother, James, also speaks to the same effect in James 5:12.
§4 The Plain And Common Sense Of The Words
- An oath is to be taken in the plain and common sense of the words, without equivocation or mental reservation. 1
- Ps. 24:4; Jer. 4:2
An oath should be made in the plain and common sense of the words, using common definitions so as to avoid and confusion, or worse—deception. Therefore, our words should be without equivocation, meaning open to multiple interpretations, and also without mental reservation, which means by not telling the wh...