The phrase "what God has put together" is a reference to marriage, and it comes from the Bible. It means that marriage is a holy thing, and humans should not break apart a marriage. The phrase is often used in the context of the marriage ceremony, and it is a reminder that the union of two people in marriage is not to be taken lightly. The phrase is found in the New Testament in the books of Matthew and Mark, where Jesus says, "What therefore God has joined together, let not man separate". This phrase is a reminder that marriage is a sacred bond that should not be broken lightly.