Exodus 20:7 (KJV)
7 Thou shalt not take the name of the Lord thy God in vain; for the Lord will not hold him guiltless that taketh his name in vain.
Deuteronomy 5:11 (KJV)
11 Thou shalt not take the name of the Lord thy God in vain: for the Lord will not hold him guiltless that taketh his name in vain.
Psalm 139:19-21 (KJV)
19 Surely thou wilt slay the wicked, O God: depart from me therefore, ye bloody men.
20 For they speak against thee wickedly, and thine enemies take thy name in vain.
21 Do not I hate them, O Lord, that hate thee? and am not I grieved with those that rise up against thee?
Matthew 5:33-37 (KJV)
33 Again, ye have heard that it hath been said by them of old time, Thou shalt not forswear thyself, but shalt perform unto the Lord thine oaths:
34 But I say unto you, Swear not at all; neither by heaven; for it is God’s throne:
35 Nor by the earth; for it is his footstool: neither by Jerusalem; for it is the city of the great King.
36 Neither shalt thou swear by thy head, because thou canst not make one hair white or black.
37 But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
1 Timothy 6:1 (KJV)
1 Let as many servants as are under the yoke count their own masters worthy of all honour, that the name of God and his doctrine be not blasphemed.
James 2:7 (KJV)
7 Do not they blaspheme that worthy name by the which ye are called?