portion - from a Hebrew root, “to divide.” God is the all-sufficient Good of His people (Num 18:20; Psa 16:5; Psa 73:26; Lam 3:24).
not like them - not like the idols, a vain object of trust (Deu 32:31).
former of all things - the Fashioner (as a potter, Isa 64:8) of the universe.
rod of his inheritance - The portion marked off as His inheritance by the measuring rod (Eze 48:21). As He is their portion, so are they His portion (Deu 32:9). A reciprocal tie (compare Jer 51:19; Psa 74:2, Margin). Others make “rod” refer to the tribal rod or scepter.