'Once' in the Bible

And Gideon said unto God, Let not thine anger be kindled against me, and I will speak but this once: let me make trial, I pray thee, but this once with the fleece; let it now be dry only upon the fleece, and upon all the ground let there be dew.

And when Delilah saw that he had told her all his heart, she sent and called for the lords of the Philistines, saying, Come up this once, for he hath told me all his heart. Then the lords of the Philistines came up unto her, and brought the money in their hand.

And Samson called unto Jehovah, and said, O Lord Jehovah, remember me, I pray thee, and strengthen me, I pray thee, only this once, O God, that I may be at once avenged of the Philistines for my two eyes.