2 Corinthians 6:15 And what concord hath Christ with Belial? or what part hath he that believeth with an infidel?

The word “concord” means “agreement”. Belial literally means “worthless, wicked”, the name of Satan. Christ’s mission is in concord with His Father’s will. Whereas Satan is in rebellion against God. Therefore, there is no common ground for cooperation. When we commit our lives to God in Christ, we are exhorted to be separate from evil, in thought and in deed. This would mean separating from those who are not in Christ for there is no common allegiance.

This was God’s warning to the children of Israel – Deuteronomy 13:6-8 If thy brother, the son of thy mother, or thy son, or thy daughter, or the wife of thy bosom, or thy friend, which is as thine own soul, entice thee secretly, saying, Let us go and serve other gods, which thou hast not known, thou, nor thy fathers; Namely, of the gods of the people which are round about you, nigh unto thee, or far off from thee, from the one end of the earth even unto the other end of the earth; Thou shalt not consent unto him, nor hearken unto him; neither shall thine eye pity him, neither shalt thou spare, neither shalt thou conceal him: