Psalms 139:13 - Joseph Benson’s Commentary on the Old and New Testaments

Thou hast possessed Or, thou dost possess, my reins The most inward and hidden part of my body, supposed also to be the seat of men's lusts and passions: thou dwellest in them, thou art the owner and governor of them, and therefore must needs know them. My most secret thoughts and intentions, and the innermost recesses of my soul, are subject to thy control. Thou hast covered me in my mother's womb With skin and flesh, as it is expressed Job 10:11. Dr. Waterland renders this verse, Thou hast formed my reins; thou hast compacted me.