Jude 1:5

Now I want to remind you , although you once fully knew it , that Jesus , who saved a people out of the land of Egypt , afterward destroyed those who did not believe .

Though you already know all this, I want to remind you that the Lord at one time delivered his people out of Egypt, but later destroyed those who did not believe.

I will therefore put you in remembrance, though ye once knew this, how that the Lord, having saved the people out of the land of Egypt, afterward destroyed them that believed not.