Let's examine that passage since you brought it up from verse 34-37.
"Again you heard that it was said to those of ancient times: You must not swear without performing, but you must pay your vows to Jehovah. 34 However, I say to you: Do not swear at all, neither by heaven, for it is Gods throne; 35 nor by earth, for it is the footstool of his feet; nor by Jerusalem, for it is the city of the great King. 36 Do not swear by your head, since you cannot turn one hair white or black. 37 Just let your word Yes mean yes, your No, no, for what goes beyond these is from the wicked one."
"Instances in which oaths were required of certain persons under the Mosaic Law were: of a wife in the trial of jealousy (Num 5:21, 22), of a bailee when property left in his care was missing (Ex 22:10, 11), of the older men of a city in the case of an unsolved murder (Deut 21:1-9). Voluntary oaths of abstinence were allowed. (Num 30:3, 4, 10, 11) Servants of God were sometimes adjured by one in authority, and they told the truth. Likewise a Christian under oath would not lie but would tell the whole truth called for, or he may refuse to answer if it jeopardizes the righteous interests of God or of fellow Christians, in which case he must be ready to suffer any consequences that might result from his refusal to testify.1Kings 22:15-18; Matt 26:63, 64; 27:11-14.
Vows were regarded in Israel as having the strength of an oath, as sacred and to be fulfilled even though they resulted in loss to the vower. God was viewed as watching to see that vows were carried out, and as bringing punishment for failure. (Num 30:2; Deut 23:21-23; Judg 11:30, 31, 35, 36, 39; Eccl 5:4-6) The vows of wives and unmarried daughters were subject to affirmation or cancellation by the husband or father, but widows and divorced women were bound by their vows.Num 30:3-15.
Jesus Christ, in his Sermon on the Mount, corrected the Jews in their practice of light, loose, and indiscriminate making of oaths. It had become common among them to swear by heaven, by the earth, by Jerusalem, and even by their own heads. But since heaven was Gods throne, earth his footstool, Jerusalem his kingly city, and ones head (or life) was dependent on God, making such oaths was the same as taking oaths in the name of God. It was not to be treated lightly. So Jesus said: Just let your word Yes mean Yes, your No, No; for what is in excess of these is from the wicked one.Matt 5:33-37." (Insight Volumes WTBTS)
When Jesus said "do not swear at all" he was saying 'if you have no intention of keeping your word, don't swear by God to do something when you don't mean it'. He said, "Just let your word Yes mean yes, your No, no" or in other words, when you make an agreement with someone, mean what you say.
It is so easy to take things out of context and put your own slant on them.
If we know our Bible....we should know all of it, not just words taken out of context to 'prove' our own point of view and to justify not doing what Jesus said we should do.
We don't want to be like.... :ignore:
Jesus absolutely did not come to make Jews out of the Gentiles. Jehovah's Witnesses use the laws of the Jews as a pattern.
In the last days there will come mockers mocking proceeding according to their own desire [not that of Jesus Christ]. Some Christian churches are mocking Israel by their adopting the law of Israel.