‘And the Lord spoke to Moses, saying, “Speak to the people of Israel, If any man’s wife goes astray and breaks faith with him’ (Numbers 5:11-12 ESV)

The test for adultery found in Numbers 5 is a troubling passage to modern ears. But before considering its spiritual meaning, we must first remember that the Mosaic law was given to expose our sinfulness and to point towards our need for a Savior to rescue us from the curse of sin. Second, we must remember that marriage is a picture of the covenant relationship that God desires with His people, so adultery also points to how we have broken that covenant with God. In Deut. 27, Moses instructed the people that as they entered the Promised Land, they were to stand and repeat aloud the curses that would fall on them if they broke the laws of the covenant with God. In similar manner, the wife suspected of adultery was to repeat the curses prescribed in Numbers 5 before the Lord. If she was indeed guilty of adultery, then she would be accursed. But if she was innocent, she would be free. Unlike the other laws that required human involvement in carrying out penalties (i.e. “stoning), this law required divine action.
Similarly, our sinfulness today is as adultery against God. We have all gone “astray.” We have all “broken faith” with God. If we were to take this adultery test, every one of us would stand accursed. However, those who have trusted Christ, will not face condemnation, for He has already drank from this bitter, accursed cup. He drained it to the bottom, swallowing the dregs of our sin whole, becoming accursed for us. Christ took the adultery test in our place, so that we might be set free.