For an explanation of Jehovah/YHWH see also: God? What’s in a Name.
The LORD is my shepherd, I shall not want; Psa. 23:1
The verb form of ra’ah is to pasture, tend, or graze.
There have been mountains of commentaries on the 23rd Psalm, and there is no way I can tell you anything you probably don’t already know.
The only one I ever read that was interesting was one written by a real farmer who raised sheep. The point that was of interest was the rod and staff.
The staff is used to separate the sheep into separate pens when needed. At different times of the year, there are different reasons for this separating. Sometimes it is for the shearing, sometimes it is for breading, sometimes it is medicating or veterinary examination, and sometimes it for slaughter.
The rod is used for discipline. It is important for the safety of the individual sheep that the herd stay together. One sheep wandering off on its own is easy prey for any predator. So when a sheep is lost the shepherd goes out and finds the laggard. He then takes the rod and breaks that sheep’s hind leg. He binds the leg up and carries it back to the fold. Every day he carries it to food and water. When the leg heals that sheep will never leave the side of the shepherd, for it has become emotionally dependent upon the shepherd.
All this gives a whole new insight to –
. . . thy rod and thy staff, they comfort me. Ps 23:4b
As well as –
. . . and he shall rule them with a rod of iron, as when earthen pots are broken in pieces, even as I myself have received power from my Father; Rev. 2:27
From his mouth issues a sharp sword with which to smite the nations, and he will rule them with a rod of iron; he will tread the wine press of the fury of the wrath of God the Almighty. Rev. 19:15
I’m not sure how the “Rod of Iron” will be manifested. Not sure how one breaks the leg of a nation? But it doesn’t sound all that pleasant.