New Living Translation
Dear friends, do not believe everyone who claims to speak by the Spirit. You must test them to see if the spirit they have comes from God. For there are many false prophets in the world.

American Standard Version
Beloved, believe not every spirit, but prove the spirits, whether they are of God; because many false prophets are gone out into the world.

Berean Study Bible
Beloved, do not believe every spirit, but test the spirits to see whether they are from God. For many false prophets have gone out into the world.

Douay-Rheims Bible
Dearly beloved, believe not every spirit, but try the spirits if they be of God: because many false prophets are gone out into the world.

English Revised Version
Beloved, believe not every spirit, but prove the spirits, whether they are of God: because many false prophets are gone out into the world.

King James Bible
Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.

World English Bible
Beloved, don't believe every spirit, but test the spirits, whether they are of God, because many false prophets have gone out into the world.

Young's Literal Translation
Beloved, every spirit believe not, but prove the spirits, if of God they are, because many false prophets have gone forth to the world;

1 John 4:1 Additional Translations ...