American Standard Version
O Jehovah, thou hast searched me, and known me .

Berean Study Bible
For the choirmaster. A Psalm of David. O LORD, You have searched me and known me.

Douay-Rheims Bible
Lord, thou hast proved me, and known me:

English Revised Version
For the Chief Musician. A Psalm of David. LORD, thou hast searched me, and known me.

King James Bible
To the chief Musician, A Psalm of David. O LORD, thou hast searched me, and known me.

World English Bible
Yahweh, you have searched me, and you know me.

Young's Literal Translation
To the Overseer. -- A Psalm by David. Jehovah, Thou hast searched me, and knowest.

Psalm 139:1 Additional Translations ...