Where is "Beis ha'Chafshis"?
'Rashi', Rashi (Melachim II, 15:5), Radak, from Yerushalmi Kidushin 1:7: He made a house in a cemetery 1 . This is like we say "b'Mesim Chafshi" (Tehilim 88:6) - a Mes is Chafshi (free, i.e. exempt) from Mitzvos.
Radak (Melachim II, 15:5), Malbim: Kingship is Avodah, for he must bear the burden of the nation, hear them and judge their cases, whether or not he wants. When he became a Metzora and dwelled in a house alone, he was Chafshi (free) of this Avodah.
Radak (Melachim II, 15:5, citing Targum Yonasan): He dwelled outside Yerushalayim 2 .
What is the meaning of "Ki Nigzar"?
'Rashi': He was banished from being among people. This is like "v'Es Asher Nigzar Aleha"(Esther 2:1).
What is the meaning of "Shofet Es Am ha'Aretz"?
Refer to Melachim II, 15:5:3:1-2.
