Hear, Israel: Yahweh is our Sovereign. Yahweh is one.
You shall love Yahweh your Sovereign with all your heart, with all your soul, and with all your might.
Matthew Henry Commentaries
Here is, I. A brief summary of religion, containing the first principles of faith and obedience, Deu_6:4, Deu_6:5.
These two verses the Hebrews reckon one of the choicest portions of scripture: they write it in their phylacteries, and think themselves not only obliged to say it at least twice every day, but very joyous in being so obliged, having this saying among them, Blessed are we, who every morning and evening say, Hear, O Israel, Yahweh is our Sovereign, is one Sovereign. But more blessed are we if we duly consider and improve.
What we are here taught to believe concerning Yahweh: that Yahweh is our Sovereign, is one Sovereign.
(1.) That the Yahweh whom we serve is Sovereign, a Being infinitely and eternally perfect, self-existent, and self-sufficient.
(2.) That He is the one only living and true Sovereign; He only is our Sovereign, and He is but one. The firm belief of this self-evident truth would effectually arm them against all idolatry, which was introduced by that fundamental error, that there are gods many. It is past dispute that there is but one Sovereign, and there is no other but He, Mar_12:32.
Let us therefore have no other, nor desire to have any other. Some have thought there is here a plain intimation of the trinity of persons in the unity of the Sovereignhead; for here is the name of Yahweh three times, and yet all declared to be one. Joyous they that have this one Master for their Sovereign; for they have but one master to please, but one benefactor to seek to.
It is better to have one fountain that a thousand cisterns, one all-sufficient Sovereign than a thousand insufficient ones.