What does the Pasuk mean when it writes, "And he went on his travels"?
Rashi #1: On the return journey from Egypt, Avraham stayed in the same guest houses as he stayed on his way down. 1
Rashi #2: It teaches us that he paid off all the credit that was still owing. 2
Seforno: The Pasuk is informing us that he traveled slowly, 3 remaining in one place until there was no more grass for his cattle to graze, and then moving on to the next location.
To teach us that a person should not switch hosts, but should always frequent the same guest-house.
Presumably, he went into debt, because, forced to go down to Egypt due to the famine, he did not yet have a chance to earn money, and was short of money when he traveled to Egypt with his entourage (See also Sifsei Chachamim). However, refer to 13:3:1.2:1.
QUESTIONS ON RASHI
Rashi writes: "This teaches proper conduct; a guest should not deviate from his regular place of lodging." Why is this so?
Gur Aryeh: One should not convey a false impression of being dissatisfied with his previous host; nor of himself being unwelcome by the host.
Rashi writes: "Upon his return, he paid his accounts." Did Avraham not have the funds to pay until now? Hashem had already promised to bless him monetarily!
Gur Aryeh: Because it was a time of famine when Avraham went down to Mitzrayim, Avraham was afraid of bandits. He therefore gave the impression of having no money with him.