'Warn' in the Bible

But I will warn you whom to fear: fear the One who, after He has killed, has authority to cast into hell; yes, I tell you, fear Him!

for I have five brothers—in order that he may warn them, so that they will not also come to this place of torment.’

But so that it will not spread any further among the people, let us warn them to speak no longer to any man in this name.”