1)
Where was "Lifnei Mishkan Ohel Mo'ed" in the days of David?
1.
'Rashi': [In front of] a Bamah in Giv'on.
2.
Malbim: Some of them (Asaf and his brothers) were in front of the Aron, and some (Heiman and his brothers) were in front of Mishkan Ohel Mo'ed in Giv'on. After Shlomo built the Beis ha'Mikdash, all of them were together.
2)
What is "k'Mishpatam"?
1.
'Rashi': It is the way that David stationed them.
3)
What is their Avodah?
1.
Redak: It is Shir - "La'avod Avodas Avodah" (Bamidbar 4:47) is Avodas ha'Korbanos.
