Matthew 5:33-34, 37

“Again, you have heard that it was said to the men of old, ‘YOU SHALL NOT MAKE FALSE VOWS, BUT YOU SHALL FULFILL YOUR VOWS TO THE LORD [as a religious duty].’ But I say to you, do not make an oath at all, either by heaven, for it is the throne of God

But let your statement be, ‘Yes, yes’ or ‘No, no’ [a firm yes or no]; anything more than that comes from the evil one. [Lev 19:12; Num 30:2; Deut 23:21]