1)
What is the meaning of "Omed Lefanai"?
1.
Targum Yonasan: Serving in front of Me. Radak (citing Sifri Bamidbar 78) - do converts enter the Heichal to serve?! Even Yisraelim may not enter! Rather, they sat on the Sanhedrin and give rulings in Torah.
2.
Radak (citing Sifri Bamidbar 78) #2: Female descendants of Yonadav married Kohanim, and their descendants served on the Mizbe'ach.