For Adonoi echad hu (there is one G-d) and there is also metavekh echad (one melitz, IYOV 33:23, YESHAYAH 43:27; cf. DEVARIM 5:5,22-31), one between Hashem and kol Bnei Adam, the man Rebbe, Melech HaMoshiach Yehoshua,