Forewarn

/fɔːrˈwɔːrn/

Modern equivalent

Forewarn; to warn beforehand

What it means

Verb meaning to caution someone about a future danger or event

In the KJV

But I will forewarn you whom ye shall fear: Fear him, which after he hath killed hath power to cast into hell; yea, I say unto you, Fear him.

Luke 12:5