What does the Torah mean when it writes that "Yakov lifted his feet"?
Rashi (from Bereishis Rabah 70:8): Following the good news that he had just received, his heart lifted his feet as it were, and he was fleet of foot.
Ohr ha'Chayim #1: He was poor and had nothing to carry, except for his feet. 1
Seforno: As opposed to someone who departs from a place because he has nowhere to stay, in which case his legs carry him, 2 when someone leaves with the intention of reaching a specific destination, he carries his feet.
Ohr ha'Chayim #2: He only needed to lift his feet, and Eretz Bnei Kedem came to him.
Malbim: Until now, it is as if his legs took him Bal Korcho (against his will). After Hashem's promises, he carried his legs.
Ha'Emek Davar: One who need not beware of obstacles, his legs carry him, and he can think about other matters. Bnei Eretz Kena'an were steeped in idolatry, but not in witchcraft. Yakov was not concerned lest he desire idolatry, so his legs carried him. Now he was heading to Aram, where they did witchcraft and seeking to know the future. Yakov was worried lest this tempt him, so he carried his legs (was careful about every step).
Why did he go to the land of Bnei Kedem? He was heading for Charan!
Ha'Emek Davar: It says Bnei Kedem because in Aram they engaged in witchcraft, like people of the [far] east, to where Avraham sent Bnei Keturah. Also Bil'am said "Min Aram
Rashi brought a Midrash that he lied down there, but not in his years in Beis Ever, One can explain that he went to Beis Ever afterwards, just like another opinion in the Midrash infers that he lied down there, but not in Beis Lavan (refer to 28:11:9:1,2).
Shem died in the year 2156. According to Megilah 17a, Yakov left Yitzchak when he was 63, in the year 2171! (PF)