'Once' in the Bible

Be mindful, therefore, of the height from which you have fallen. Repent at once, and act as you did at first, or else I will surely come and remove your lampstand out of its place--unless you repent.

Repent, at once; or else I will come to you quickly, and will make war upon them with the sword which is in My mouth.

Then the voice which I had heard speaking from Heaven once more addressed me. It said, "Go and take the little book which lies open in the hand of the angel who is standing on the sea and on the land."

And the Wild Beast which once existed but does not now exist--he is an eighth king and yet is one of the seven and he goes his way into perdition.

And I saw the Wild Beast, and the kings of the earth, and their armies, all assembled to make war, once for all, against the Rider upon the horse and against His army. And the Wild Beast was captured, and with him the false Prophet