New King James Version
Test all things; hold fast what is good.

King James Bible
Prove all things; hold fast that which is good.

American Standard Version
prove all things; hold fast that which is good;

Berean Study Bible
but test all things. Hold fast to what is good.

Douay-Rheims Bible
But prove all things; hold fast that which is good.

English Revised Version
prove all things; hold fast that which is good;

World English Bible
Test all things, and hold firmly that which is good.

Young's Literal Translation
all things prove; that which is good hold fast;

1 Thessalonians 5:21 Additional Translations ...