King James Version
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.New International Version
Though you already know all this, I want to remind you that the Lord delivered his people out of Egypt, but later destroyed those who did not believe.Catholic Public Domain Version
So I want to caution you. Those who once knew everything that Jesus did, in saving the people from the land of Egypt, afterwards perished because they did not believe