Old Testament passages which comfort me

Psalm 138:8
The LORD will accomplish what concerns me; Thy lovingkindness, O LORD, is everlasting; Do not forsake the works of Thy hands.

The LORD will--what a sweet assurance.

Psalm 4:8
In peace I will both lie down and sleep, for Thou alone, O LORD, dost make me to dwell in safety.

Thou alone--what better guarantees peace for the night?