Komentaryo sa Genesis 13:17: Chizkuni, Ramban, Kli Yakar & Or HaChaim

קום התהלך בארץ, “arise and walk throughout the land;” in order to establish claim to it.

ARISE, WALK THROUGH THE LAND IN THE LENGTH AND IN THE BREADTH OF IT. It is possible that this is a matter of option, depending on his will.¹⁰⁹It is not a command that he go through the entire land, rather it is a promise that he need not fear whenever and wherever he will go. The Eternal thus told Abraham, “Go wherever you wish to go in the land for I will be with you and guard you from the evil of the nations, for unto thee will I give it, that is to say, the land will be yours.” And if it be a command that Abraham should traverse the length and breadth of the land in order to take possession of his gift, as I have explained,¹¹⁰Above, 12:6. he was not commanded to do this immediately. He did so ultimately for he was now in the east, and afterwards he went to the land of the Philistines which is in the west, and thus he fulfilled the command during his lifetime.
The meaning of the expression, to thee… and to thy children,¹¹¹Verse 15 here. is that you are to take possession of the gift now, in order to transmit it to your children, even as our Rabbis have said:¹¹²Baba Bathra 119b. “The land of Israel is an inheritance to the people of Israel from their patriarchs.”
By way of the plain meaning of Scripture, it is possible that the meaning of the verse is that Abraham was to be a ruler over the land and a prince of G-d in its midst,¹¹³See Genesis 23:6. wherever he will go in this land.

Arise, walk through the land in its length and in its breadth. Look to the right and see that initially, the Holy One, Blessed be He, said to Abraham, Please lift up your eyes and see from the place where you are standing there, northward and southward and eastward and westward, for all the land that you see, I will give to you and to your descendants forever. This implies that sight alone was sufficient to acquire it. But afterwards, He reversed this and said, Arise, walk through the land in its length and in its breadth, for I will give it to you. This implies that one needs to make an actual possession like marking the boundaries (Bava Kamma 9a), and sight alone was not enough to acquire it. Furthermore, initially He said to your descendants forever, but afterwards He said for I will give it to you, without mentioning descendants or “forever.” Additionally, He said please lift [na in Hebrew, indicating a request], but when saying arise, walk through the land, He did not use the term na. And with Moses our Rabbi, peace be upon him, the approach is reversed, as it says Let me cross over, please, and see the land (Deuteronomy 3:25). Here, the term na is used with the actual crossing, which is similar to arise, walk through the land, but regarding seeing, he did not use na, as he didn’t say “and let me see, please.” Moreover, what is meant by saying here and see from the place where you are standing there? Would you think he would see from a place where he is not standing?