2 Bible Verses about Swearing Being Forbidden

But I tell you not to swear at all; neither by Heaven, for it is God's throne;

But above all things, my brethren, do not swear, either by Heaven or by the earth, or with any other oath. Let your 'yes' be simply 'yes,' and your 'no' be simply 'no;' that you may not come under condemnation.