וְגַם־לְל֔וֹט הַהֹלֵ֖ךְ אֶת־אַבְרָ֑ם הָיָ֥ה צֹאן־וּבָקָ֖ר וְאֹהָלִֽים׃
At si Lot din, na kasama ni Abram, ay may mga kawan ng tupa, at mga bakahan, at mga tolda.
Rashi
ההלך את אברם WHO WENT WITH ABRAM — What brought it about that he possessed all this? The fact that he was accompanying Abram (Genesis Rabbah 41:3; Pesikta Rabbati, שמיני).
Radak
וגם ללוט, the word וגם is meant to add that even Lot, who had only been a member of Avram’s entourage, was showered with wealth while Avram stayed in Egypt. [clearly a very short time if G’d punished Pharaoh already on the same night that he had taken Sarai. Ed.]
Siftei Chakhamim
What brought this about? Rashi is answering the question: It is already written (v. 1), “Avram went ... together with Lot into the south,” [so why is it repeated?]