Ellicott's Commentary for English Readers - Matthew 5:34-35
(34-35) Neither by heaven; . . . nor by the earth; . . . neither by Jerusalem.—Other formulæ of oaths meet us in Matthew 23:16-22; James 5:12. It is not easy at first to understand the thought that underlies such modes of speech. When men swear by God, or the name of Jehovah, there is an implied appeal to the Supreme Ruler. We invoke Him (as in the English form, “So help me God”) to assist and bless us according to the measure of our truthfulness, or to punish us if we speak falsely. But to... read more
Ellicott's Commentary for English Readers - Matthew 5:34
(34) Swear not at all.—Not a few interpreters, and even whole Christian communities, as e.g. the Society of Friends, see in these words, and in James 5:12, a formal prohibition of all oaths, either promissory or evidential, and look on the general practice of Christians, and the formal teaching of the Church of England in her Articles (Art. xxxix.), as simply an acquiescence in evil. The first impression made by the words is indeed so strongly in their favour that the scruples of such men ought... read more