'Unless' in the Bible

And Joab said, As God liveth, unless thou hadst spoken, surely then in the morning the people had gone up every one from following his brother.

David replied, “Good, I will make a covenant with you. However, there’s one thing I require of you: Do not appear before me unless you bring Saul’s daughter Michal here when you come to see me.”

The king and his men went to Jerusalem against the Jebusites, the inhabitants of the land, who spoke to David, saying, "Unless you take away the blind and the lame, you shall not come in here;" thinking, "David can't come in here."