Genesis 13:14

And the Lord said to Abram, after that Lot had separated from him, Lift up now thine eyes, and look, from the place where thou art, to the north and to the south, to the east and to the west:

אחרי הפרד לוט, G’d did not say what follows while Lot was still in Avram’s company, so that the latter would not boast and his shepherds would engage in stealing grazing land from the local inhabitants claiming G’d’s promise to Avram of future possession as their justification.

וה' אמר אל אברם, this occurred while Lot was still with him. [otherwise the Torah would have used the mode of the immediate past, i.e. ויאמר. Ed.] If not, you might have thought that Lot and his descendants could also have staked a claim to part of the land of Canaan, seeing he was a blood relative of Avram. Now G’d wanted to correct Avram who had said to Lot in verse 9 “the whole land is in front of you, i.e. at your disposal.” Now that Lot had separated from Avram, away from the land of Canaan, G’d wanted to make certain that His promise to Avraham of the land of Canaan applied exclusively to direct offspring of Avram, not to relatives who were descendants of his father Terach. G’d‘s. words contained an implied criticism of Avram having offered Lot a choice which would have made him owner of part of the land of Canaan, when he had said to him: “if to the left, I will go to the right, and if to the right, I will go to the left.” Both the left and the right, i.e. north and south from where he stood, will be his and his descendants. Also east and west would be his. The reason why G’d mentioned north and south first, was because those were the areas which Avram had spoken to Lot about. In Deuteronomy 20,19 Moses quotes the lands which will be the inheritance of Lot’s descendants.