Mat 26:74 Then began he to curse and to swear, [saying], I know not the man. And immediately the rouster crew.
Above Peter is curseing and swearing, swearing is not the same as curseing... back then you could swear you were going to do something for God, and it wasnt like a curse or bad language.. but an oath. But now Jesus tells us not to swear at all...
Mat 5:34 But I say unto you, Swear not at all; neither by heaven; for it is God's throne:
Mat 5:35 Nor by the earth; for it is his footstool: neither by Jerusalem; for it is the city of the great King.
Mat 5:36 Neither shalt thou swear by thy head, because thou canst not make one hair white or black.
Mat 5:37 But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
So i would say you are looking for corrupt communication or curseing...passages.
Eph 4:29 Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.
Our words can offend...
Jam 3:1 My brethren, be not many masters, knowing that we shall receive the greater condemnation.
Jam 3:2 For in many things we offend all. If any man offend not in word, the same [is] a perfect man, [and] able also to bridle the whole body. Jam 3:3 Behold, we put bits in the horses' mouths, that they may obey us; and we turn about their whole body.
Jam 3:4 Behold also the ships, which though [they be] so great, and [are] driven of fierce winds, yet are they turned about with a very small helm, whithersoever the governor listeth.
Jam 3:5 Even so the tongue is a little member, and boasteth great things. Behold, how great a matter a little fire kindleth!
Jam 3:6 And the tongue [is] a fire, a world of iniquity: so is the tongue among our members, that it defileth the whole body, and setteth on fire the course of nature; and it is set on fire of hell. Jam 3:7 For every kind of beasts, and of birds, and of serpents, and of things in the sea, is tamed, and hath been tamed of mankind:
Jam 3:8 But the tongue can no man tame; [it is] an unruly evil, full of deadly poison. Jam 3:9 Therewith bless we God, even the Father; and therewith curse we men, which are made after the similitude of God.
Jam 3:10 Out of the same mouth proceedeth blessing and cursing. My brethren, these things ought not so to be.
