'Once' in the Bible

For thus saith the LORD, Behold, I will sling out the inhabitants of the land at this once, and will distress them, that they may find it so.

I have seen thine adulteries, and thy neighings, the lewdness of thy whoredom, and thine abominations on the hills in the fields. Woe unto thee, O Jerusalem! wilt thou not be made clean? when shall it once be?

Therefore, behold, I will this once cause them to know, I will cause them to know mine hand and my might; and they shall know that my name is The LORD.