'Unless' in the Bible

Remember then how far you have fallen; repent, and do the works you did at first. Otherwise, I will come to you and remove your lampstand from its place—unless you repent.

Look! I will throw her into a sickbed and those who commit adultery with her into great tribulation, unless they repent of her practices.

And it was given to him to put breath into the image of the beast, in order that the image of the beast both spoke and caused that all those, unless they worshiped the image of the beast, should be killed.

so that no one can buy or sell unless he has the mark: the beast’s name or the number of his name.