God’s Design vs. Cultural Regulation

Some people argue that because laws concerning multiple wives appear in the Old Testament, God was establishing polygamy as acceptable. However, when the Scriptures are examined carefully, the text never commands men to take multiple wives. Instead, the laws regulate situations where polygamy already existed within the culture.

There is a major difference between God commanding something and God regulating something already happening in society because of human weakness and fallen conditions.

For example, Deuteronomy 21:15–17 begins with the phrase, “If a man have two wives…” It does not say, “A man shall take two wives.”

The law is conditional, meaning it addresses what should happen if that situation exists. Its purpose was to prevent injustice, favoritism, and abuse within the household. The same principle appears in Exodus 21:10, which says, “If he take him another wife…” Again, this is regulation, not a command to multiply wives.

In fact, God directly warned kings in Deuteronomy 17:17, saying, “Neither shall he multiply wives to himself, that his heart turn not away…” This warning reveals that multiplying wives carried spiritual danger and was never presented as God’s ideal design. The issue was not merely the number of women, but the divided heart that often followed. Throughout Scripture, divided affections led to divided loyalties, compromise, idolatry, and eventually the downfall of households and kingdoms.

This connects powerfully to Malachi 2:14–15, where God speaks about covenant faithfulness, saying, “The Lord hath been witness between thee and the wife of thy youth… she is thy companion…” Here, marriage is presented as a sacred covenant bond between a husband and his wife. The language points toward loyalty, unity, and faithfulness rather than divided relationships. God emphasizes companionship and covenant, revealing His heart for enduring faithfulness within marriage.

Jesus later reaffirmed this original design in Matthew 19:4–6 when He said, “He which made them at the beginning made them male and female… and they twain shall be one flesh.” Christ did not point back to polygamous households as the model. Instead, He pointed all the way back to creation itself, restoring the focus to one man and one woman joined together as one flesh in covenant before God.

The apostle Paul continues this same pattern in 1 Corinthians 7:2, saying, “Nevertheless, to avoid fornication, let every man have his own wife, and let every woman have her own husband.” The wording reflects mutual, singular covenant relationship. Each husband with his wife, and each wife with her husband. This mirrors the same covenant faithfulness seen from Genesis to Malachi to the teachings of Christ.

Taken together, these passages reveal a consistent biblical pattern. God tolerated and regulated certain practices in fallen cultures to reduce harm and injustice, but His design consistently pointed back to covenant faithfulness between one man and one woman. The Mosaic laws acknowledged realities within society, but Malachi revealed God’s heart, Jesus restored the original design, and Paul reinforced that pattern within the New Testament church.

Biblically, people often distinguish between what could be called “command laws” and “regulation laws” to help explain how certain laws in the Old Testament functioned. While the Bible itself does not formally use those exact labels, the concepts are useful for understanding the difference between laws that express God’s direct moral will and laws that regulate human behavior in a fallen society.

A command law is a law that directly expresses God’s moral standard, character, or intended design. These laws are usually straightforward commands about right and wrong and are rooted in holiness, justice, faithfulness, and worship.

Examples include:

In Exodus 20:13
“Thou shalt not kill.”

In Exodus 20:14
“Thou shalt not commit adultery.”

In Deuteronomy 6:5
“Thou shalt love the LORD thy God with all thine heart…”

These laws are direct moral commands. They reveal what God desires and expects.

A regulation law, on the other hand, addresses situations already existing within human culture and society. These laws do not necessarily mean God approved of the behavior itself as ideal, but they established boundaries, justice, and protections within imperfect human conditions.

Examples include laws about:

• slavery
• divorce
• warfare
• multiple wives
• inheritance disputes

For example, Exodus 21:10 says:
“If he take him another wife…”

This is not commanding polygamy. It regulates the situation by protecting the first wife from neglect.

Likewise, Deuteronomy 21:15–17 says:
“If a man have two wives…”

Again, this regulates inheritance rights in an existing situation rather than commanding men to marry multiple women. One of the clearest biblical explanations for this principle comes from Jesus Himself in Matthew 19:8 regarding divorce:

“Moses because of the hardness of your hearts suffered you to put away your wives: but from the beginning it was not so.”

Jesus shows that some laws were permitted or regulated because of human hardness and brokenness, even though they did not reflect God’s original design from creation.

So biblically, the distinction works like this:

• Command laws reveal God’s direct moral will and ideal standards.
• Regulation laws manage and restrain the damage caused by human sin and cultural realities while still maintaining justice and order.

This is why Genesis presents one man and one woman becoming one flesh as God’s design, while later Mosaic laws regulate situations involving divorce or multiple wives because those practices already existed within society.