1)
What day was this?
1.
Malbim: It was the day mentioned below (8), when he cast Klei Toviyah [out of the chamber]. He was an Amoni convert, and he was the son-in-law and Mechutan of Sarei ha'Am, like it says above (6:18).
2)
What is "Sefer Moshe"?
1.
Malbim: It is Mishneh Torah, which Moshe said, in which is this warning [against marrying Amoni converts].
