Scripture plainly reveals that God repeatedly calls for His people to separate from the world. This separation extends to every aspect of life, especially including the marriage bond. Why? Because God knows the very real danger that unbelievers pose to believers by drawing them away from Him (Deuteronomy 7:3-4; Judges 3:6-7; 1 Kings 11:2). This is why God specifically instructed His people in both the Old and New Testament to marry among themselves (Jew with Jew and Christian with Christian). The nation of Israel was forbidden to yoke up with the surrounding nations because Israel would adopt heathen practices and the worship of false gods (Exodus 34:15-16). Though God’s commands for the New Testament believer are often different from His plan for the Jew, in this aspect they remain constant and unchangeable.
God offered man the greatest statement of loyalty when Christ promised never to leave the believer. The Lord did not promise some type of reciprocating loyalty conditioned upon man’s loyalty toward Him. Rather, the Lord promised He will “never leave . . . nor forsake.” Man’s frailty offers God numerous reasons and opportunities to justify leaving and forsaking, but God’s character overrides man’s frailty. If the Lord promises loyalty, He fulfils that promise without requiring reciprocity. According to 2 Peter 3:9, “The Lord is not slack concerning his promise.” Once a man is born again, he becomes a child of God and immediately becomes the beneficiary of promised loyalty given to him by the Son of God.