1)
What is the meaning of "Sho'arim Mishmar [ba'Asupei ha'She'arim]"?
1.
Rashi: They were gatekeepers in their Mishmar to guard the gates of the Bayis. "Ba'Asupei" is like Sifei (the thresholds).
2)
What are "Asupei ha'She'arim"?
1.
Rashi: "Ba'Asupei" is like Sifei (the thresholds of the gates). Ibn Ezra - the Aleph is extra.
