C. F. Keil and Franz Delitzsch on Genesis 12:4-5

Gen 12:4-5

Removal to Canaan. - Abram cheerfully followed the call of the Lord, and “departed as the Lord had spoken to him.” He was then 75 years old. His age is given, because a new period in the history of mankind commenced with his Exodus. After this brief notice there follows a more circumstantial account, in Gen 12:5, of the fact that he left Haran with his wife, with Lot, and with all that they possessed of servants and cattle, whereas Terah remained in Haran (cf. Gen 11:31). עשׂוּ אשׁר הנּפשׁ are not the souls which they had begotten, but the male and female slaves that Abram and Lot had acquired.