Actually, it is not a JW teaching, but it is biblical to a couple billion Christians. And it has been such for a couple thousand years...have you listened to Jesus advise
This means everlasting life, their taking in knowledge of you, the only true God, and of the one whom you sent forth, Jesus Christ. JOHN 17;3
the true God is JEHOVAH psalm 83;18 and he sent forth his son as it tells us at John 3;16-17
many think they are one and the same ,but that is not a bible teaching .