'Safety' in the Bible

saying, The prison-house we found shut in all safety, and the keepers standing at the doors: but when we had opened, we found no man within.

Wherefore I beseech you to take some food: for this is for your safety: for there shall not a hair perish from the head of any of you.

When they are saying, Peace and safety, then sudden destruction cometh upon them, as travail upon a woman with child; and they shall in no wise escape.