Jeremías 22:6 Midrash: Mekhilta DeRabbi Yishmael, Sifrei Devarim & Yalkut Shimoni

And whence is it derived that all of Moses' requests were granted by the Holy One Blessed be He? From (Ibid. 34:1) "And the L–rd showed him the whole land." This is Eretz Israel. He asked to see the Temple and He showed it to him, viz. (Ibid.) "and Gilead," Gilead being the Temple, viz. (Jeremiah 22:6) "Gilead are you (the Temple) to Me, the head of the Levanon."

"and the Levanon": He said to them: When you come to the land, you must appoint a king for yourselves and build the Temple. And whence is it derived that "Levanon" is a king? From (Ezekiel 17:3) "… came to the Levanon and took the crown of cedar," and (II Kings 14:9) "The thornbush in Levanon (once) sent (word) to the cedar of Levanon, saying: Give your daughter to my son for a wife. The wild beast of Levanon then came by and trampled the thornbush." Variantly: "Levanon" is the Temple, as it is written (Jeremiah 22:6) "Gilead are you (the Temple) unto Me, the summit of the Levanon," and (Isaiah 10:34) "The Levanon will fall by a mighty one."

"and the Levanon": This is the Temple, viz. (Jeremiah 22:6) "You are Gilead to Me, the head of the Levanon, etc.", and (Isaiah 10:34) "And the Levanon by a mighty one will fall." And why is it called "Levanon"? Because it "whitens" (malbin) the sins of Israel, as it is written (Ibid. 1:18) "If your sins be like scarlet, they will be as white (yalbinu) as snow."