'Precious' in the Bible

So he {again sent} a third [time] a commander of fifty and his fifty, and the commander of the third fifty went up and came and knelt down on his knees before Elijah and entreated him. He said to him, " man of God, please let my life and the lives of your servants, these fifty, be precious in your eyes.

Behold, fire from heaven came down and consumed the first two commanders of fifty and their fifties, so then let my life be precious in your eyes."