Whatever Belongs to Me Endures Forever in Tanchuma Tetzaveh

"And this is the thing that you shall do to them" (Exodus 29:1). To them you shall do it, and not to others. He began to teach them how they were to purify themselves and eat of the holy things, how they were to immerse themselves and eat of the terumah (the priestly portion). "To sanctify them to serve Me as priests" (li). Rabbi Mani said in the name of Rabbi Eliezer: Wherever "to Me" (li) is stated, it is forever and to all eternity. The firstborn are forever, as it is said, "For every firstborn is Mine" (Numbers 3:13). The silver and the gold are forever, as it is said, "Mine is the silver and Mine is the gold" (Haggai 2:8). The kingship is forever, as it is said, "For I have seen among his sons a king for Myself" (I Samuel 16:1). The land is forever, as it is said, "For the land is Mine" (Leviticus 25:23). Israel is forever, as it is said, "For the children of Israel are Mine" (Leviticus 25:55). The Levites are forever, as it is said, "And the Levites shall be Mine" (Numbers 3:12). The priesthood is forever, as it is said, "to serve Me as priests" (Exodus 29:1).