Midrash su II Re 21:12

(Exodus 23:17) "in the presence of the Master, the L rd": What, then, is the intent of (Ibid. 34:23) "the G d of Israel"? It is with Israel that He especially unifies His name. Similarly, (Devarim 6:4) "Hear, O Israel, the L rd our G d, the L rd is One." Is it not already written "the L rd our G d." Why, then, "the L rd is One"? It is with us that He especially unifies His name. Similarly (II Kings 21:12) "Therefore, thus said the L rd the G d of Israel." Is it not already written (Jeremiah 32:27) "the "God of all flesh"? Why, then, "the G d of Israel"? It is with Israel that He especially unifies His name. Similarly, (Psalms 50:7-8) "Hear, My people, and I will speak; Israel, and I will exhort you. I am G d, your G d. I will not rebuke you for (remissness in) your sacrifices and (because) your burnt-offerings are (not) constantly before Me." I am G d to all who enter the world, notwithstanding which I have unified My name only with My people, Israel.