'Unless' in the Bible

Do not refuse one another, unless perhaps it is just for a time and by mutual consent, so that you may devote yourselves to prayer and may then associate again; lest the Adversary begin to tempt you because of your deficiency in self-control.

through which also you are obtaining salvation, if you bear in mind the words in which I proclaimed it--unless indeed your faith has been unreal from the very first.

Foolish man! the seed you yourself sow has no life given to it unless it first dies;