'Unites' in the Bible

That is why a man leaves his father and mother and unites with his wife, and they become a new family.

Accordingly, she will be designated as an adulteress if she unites herself to another man while her husband is alive. But if her husband dies, she is free from the law [regarding marriage], so that she is not an adulteress if she marries another man.

You know that the person who unites himself with a prostitute becomes one body with her, don't you? For it is said, "The two will become one flesh."

But the person who unites himself with the Lord becomes one spirit with him.