2 Corinthians 6:14
Be you not unequally yoked together with unbelievers: for what fellowship has righteousness with unrighteousness? and what communion has light with darkness?
Topicalbible.org—AKJV

2 Thessalonians 3:6
Now we command you, brothers, in the name of our Lord Jesus Christ, that you withdraw yourselves from every brother that walks disorderly, and not after the tradition which he received of us.
Topicalbible.org—AKJV

Genesis 2:24
Therefore shall a man leave his father and his mother, and shall join to his wife: and they shall be one flesh.
Topicalbible.org—AKJV