Or, so says Deuteronomy 6:4.
Sh'ma, yis'ra`al y'hvah `elohaynu y'hvah `eHad
"Heed Israel YaHuWeH [is] our God YaHuWeH alone"
That the Sh'ma says nothing of God's Unity (or Trinity for that matter) is highly debated. However, we can be sure of its meaning from its context. In Deuteronomy 4:35, Moses says:
"It was shown you, so that you might comprehend; YaHuWeH, He [is] God, and none moreover apart from Him."Likewise, Deuteronomy 32:39 says:
"See now that I, I am He, and there is no other God with Me. I kill, and I keep alive. I wound and I heal, and there is no deliverer from My hand."The great Sh'ma is not saying that "YaHuWeH is one (integral)" as is commonly understood, or even that YaHuWeH is the only God. It says that "YaHuWeH and no other is our God."