"this good mountain and the Levanon." All called it (Jerusalem) "mountain." Abraham called it "mountain," viz. (Bereshith 22:14) "… of which it will be said: 'On this day, in the mountain, the L-rd shall appear.'" Isaiah called it mountain (Isaiah 2:2) "And it will be in the end of days that the mountain of the house of the L-rd will be established." Nations called it mountain, viz. (Ibid. 3) "And many nations will go, and they will say: 'Let us go and ascend to the mountain of the L-rd.'"
"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."