What is the gist of the first half of the covenant, as contained in this Pasuk?
Rashi: That neither side (including their offspring) would ever cross the Mitzpah to harm the other 1 , and they will not see one another.
What was the Mitzpah? Why was it called by that name?
Rashi: They called the pile also Mitzpah, 1 because they said to one another "Hashem will keep watch over us
And if this is synonymous with 'Mitzpeh Gil'ad' (refer to 31:49:2:1*, it was because they named the place after the stone.
Tosfos ha'Shalem (52:3), Malbim (51): Lavan wanted two witnesses, for he stipulated two matters (Shalom, and afflicting his daughters). Yakov stipulated only about Shalom, so one witness sufficed for him.
Who is the subject of "Asher Amar"?
Ha'Emek Davar: "Amar" refers to both of them. Yakov said that it will be a Matzevah, and Lavan said that Hashem will see [if Yakov pains his daughters].