Charles Ellicott Commentary Psalms 139:9

"If I take the wings of the morning, And dwell in the uttermost parts of the sea;" — Psalms 139:9 (ASV)

If ... —Literally,

I lift wings of dawn
I dwell in the end of the sea.

The wings of the morning.— This exquisite image, suggesting not only the pinions of cloud that seem often to lift the dawn into the sky but also the swift sailing of the light across the world, may be compared to the wings of the sun in Malachi 4:2, and the wings of the wind in Psalm 18:10.

The uttermost parts of the sea— i.e., to a Hebrew, the extreme west. The poet imagines himself darting from east to farthest west with the rapidity of light.