Jamieson, Fausset and Brown on Genesis 45:24

24. so he sent his brethren away--In dismissing them on their homeward journey, he gave them this particular admonition:

See that ye fall not out by the way--a caution that would be greatly needed; for not only during the journey would they be occupied in recalling the parts they had respectively acted in the events that led to Joseph's being sold into Egypt, but their wickedness would soon have to come to the knowledge of their venerable father.