'Once' in the Bible

Do not be terrified of his presence! Go at once and do not delay when a matter [is] unpleasant, for he can do anything that he desires.

When a sentence is not executed at once against a crime, the human heart is encouraged to do evil.

There was once a small city with a few men in it, and a mighty king attacked it, besieging it and building strong siege works against it.

and the dust returns to the earth as it once was,and the spirit returns to God who gave it.