'Once' in the Bible

Dear friends, although I have been eager to write to you about our common salvation, I now feel compelled instead to write to encourage you to contend earnestly for the faith that was once for all entrusted to the saints.

Now I desire to remind you (even though you have been fully informed of these facts once for all) that Jesus, having saved the people out of the land of Egypt, later destroyed those who did not believe.