Matthew 6:24
No person can serve two masters, for he will either hate the one and love the other, or else he will cling to the one and look down on the other. You cannot serve God and material things [at the same time].
1 Corinthians 10:21-22
You cannot drink [both] the cup of the Lord and the cup of evil spirits [i.e., and still be acceptable to God]. You cannot share in [both] the Lord's table and the table of evil spirits [and still be acceptable to God].
Matthew 22:12
He said to the man, 'Friend, how did you get in here without wearing the proper wedding outfit?' And he could not say a word.
Matthew 22:34
But when the Pharisees heard that Jesus had silenced [the objections of] the Sadducees, they gathered together [i.e., to continue plotting against Jesus. See verse 15].
Matthew 22:36
"Teacher, which one is the greatest commandment in the law of Moses?" he asked.
Luke 6:13
And when it was daylight, He called His disciples and chose from among them twelve, whom He also called apostles.
Romans 3:19
Now we [all] know that everything the law says applies to those who are under [obligation to obey] that law, [Note: Here "the law" appears to refer to the Old Testament Scriptures generally, since Psalms and Isaiah are quoted. See verses 10-18]. This is so that the mouth of every objector may be stopped [i.e., from making excuses for his sin], and thereby bring the entire world under God's judgment [i.e., both Jews and Gentiles].
Romans 6:16-22
Do you not know that you are the slaves of whoever you offer your obedience to? If you obey [the desire to] sin, it leads to [spiritual] death; or if you obey [God] it leads to righteousness.
2 Corinthians 6:14-16
Do not team up with unbelievers [i.e., in close relationships, such as marriage, etc.]. For what do righteousness and wickedness have in common? Or, what fellowship can light have with darkness?
Revelation 3:15-16
I know about your deeds, that you are neither [spiritually] cold nor hot. I wish you were [either] cold or hot.