Albert Barnes' Notes on the Whole Bible - Matthew 5:34-35
But I say unto you, Swear not at all - That is, in the manner which he proceeds to specify. Swear not in any of the common and profane ways customary at that time.By heaven; for it is God’s throne - To swear by that was, if it meant anything, to swear by Him that sitteth thereon, Matthew 23:22.Nor by the earth; for it is his footstool - Swearing by that, therefore, is really swearing by God. Or perhaps it means:1.That we have no right to pledge, or swear by, what belongs to God; and,2.That... read more
The Pulpit Commentary - Matthew 5:35
Nor by Jerusalem . The Hebraistic ἐν is here exchanged for the less unclassical εἰς , the reason, perhaps, being that definite direction of one's thought towards Jerusalem was, as it seems, insisted upon by some. "Rabbi Judah saith, He that saith, By Jerusalem, saith nothing, unless with an intent purpose he shall vow towards Jerusalem" (Tosipht., 'Ned.,' 1., in Lightfoot,' Her Hebr.'). So Revised Version margin, toward. For it is the city , etc. ( Psalms 48:2 ). read more