1)
Where are the two doors?
1.
Rashi: Every opening has two doors to close it opposite each other ? one is on the northern Mezuzah, and the other is in the southern Mezuzah.
2.
Radak, Vilna Gaon: One does not make a lone door for a gate. The verse need not teach this! Rather, each opening had doors inside and doors outside Refer to 41:24:1:1.
2)
What is "vela'Kodesh"?
1.
Radak, Vilna Gaon, Malbim: It is the Dvir (Kodesh ha'Kodoshim).