1)
Where is "Lifnei Hashem" referring to?
1.
Yerushalmi Sotah, 1:5: Whenever the Torah says "Lifnei Hashem" it is referring to 'Sha'ar Nikanor' - the gate that leads from the Ezras Nashim to the Ezras Yisrael. 1
1
Torah Temimah: From the Machaneh Leviyah to the Machaneh Shechinah.
2)
Why does the Torah insert "Ve'asah es Chataso ve?es Olaso" (and not simply write "Ve'hikrivam Lifnei Hashem")?