Why does the Torah switch from "Asher Yiga be'Mishkavo" (in Pasuk 5) to "ha'Yoshev al ha'K'li"?
Rashi: To teach us that the Moshav renders Tamei the person who sits on it, together with the clothes he is wearing, even though he has not touched it. 1
Why does the Torah write "ve'ha'Yoshev al ha'Keli asher Yashav alav ha'Zav" and not simply "ve'ha'Yoshev al asher Yashav ha'Zav"?
Sifra: To teach us that someone who sits on a chair on which a Zav sat but is not currently sitting is Tamei.
Why does the Torah write "ve'ha'Yoshev al ha'Keli ... " and not simply "ve'ha'Yoshev al Moshav ha'Zav"?
Sifra: To incorporate Merkav in the current Din.
What can we learn from the fact that the Torah writes " ve'ha'Yoshev ... asher Yashav alav ha'Zav" and not simply " ve'ha' Shochev alav" (with reference to Mishkav in Pasuk 5)?