1)
Who asked and brought Slav?
1.
Rashi: Yisrael asked for meat, and Hashem brought to them Slav.
2.
Radak: In Midbar Sin, Yisrael asked for bread and meat, and Hashem brought to them "ba'Erev Basar Le'echol v'Lechem ba'Boker Lisbo'a" (Shemos 16:8).
3.
Malbim: In Midbar Sin, Yisrael asked for bread, and Hashem brought to them Slav temporarily (but not constantly in the Midbar).
2)
What is "Lechem Shamayim"?
1.
Radak: It is manna.
3)
Why does it say "Yasbi'em"?
1.
Radak: This corresponds to their request "b'Achlenu Lechem la'Sova" (Shemos 16:3).
2.
Malbim: It says "Basar Le'echol v'Lechem ba'Boker Lisbo'a" (Shemos 16:8).