The superscription of Psalm 23 states that this psalm is written by David.  Before becoming king, David’s vocation was that of a shepherd.    1 Samuel 16:11 — And Samuel said to Jesse, Are these all the children? And he said, There remains yet the youngest, and behold, he is tending the sheep. Then Samuel said to Jesse, Send and bring him; for we will not sit down until he comes here.  David knew all to well what it meant to be a shepherd and how sheep tend to act.  So as David posits his relationship with YHWH, he comes to understand that he is as dependent upon God as his sheep are of him.  So David pens Psalm 23 as an exposé of God as a Shepherd.

The Shepherd and the Sheep - Psalm 23

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