New International Version
The blameless spend their days under the LORD's care, and their inheritance will endure forever.

American Standard Version
Jehovah knoweth the days of the perfect; And their inheritance shall be for ever.

Berean Study Bible
The LORD knows the days of the blameless, and their inheritance will last forever.

Douay-Rheims Bible
The Lord knoweth the days of undefiled; and their inheritance shall be for ever.

English Revised Version
The LORD knoweth the days of the perfect: and their inheritance shall be for ever.

King James Bible
The LORD knoweth the days of the upright: and their inheritance shall be for ever.

World English Bible
Yahweh knows the days of the perfect. Their inheritance shall be forever.

Young's Literal Translation
Jehovah knoweth the days of the perfect, And their inheritance is -- to the age.

Psalm 37:18 Additional Translations ...