Ro'i (H7473) is the possessive form β not merely 'a shepherd' but my shepherd. It is the opening declaration of the most beloved psalm in the world: 'The LORD is my shepherd' (Psalm 23:1). The word combines pastoral care, ownership, guidance, provision, and protection in one intimate claim.
The shepherd image runs through all of Scripture. Moses was a shepherd before leading Israel. David was called from the flocks. God Himself is called the Shepherd of Israel (Psalm 80:1). Jesus is the Good Shepherd (John 10:11). The word ro'i is intimate β not 'a shepherd somewhere' but the one who tends me personally. It asserts a relationship of dependence and trust.