First off, there are hundreds of trmples all over ancient egypt with hieroglyphics stating the king protects egypt from barbarians and shows him bashing their head in. There are steles which record all kinds of victories over barbarian peoples and they often denigrate the people. And I'm not sure how you couldn't find any sources, I literally got dozens of sites right away... but here you go. https://www.thetorah.com/article/egypts-attitude-towards-foreigners#:~:text=In%20ancient%20Egypt%2C%20the%20attitude%20towards%20foreigners%20varied,a%20mace%20on%20the%20exterior%20of%20temple%20walls.

https://www.gradevalley.com/ancient-egyptian-attitudes-towards-foreigners

https://anthropology.msu.edu/anp455-fs18/2018/11/29/foreigners-in-egypt/ here they talk about how subjected princes or their kids were taken to egypt to be culturally washed and made egytian to be sent back to rule their people under egypt.

https://chrisnaunton.com/2020/09/03/the-foreigner-as-scapegoat-lessons-from-ancient-egypt-and-today/

https://www.bloomsbury.com/us/foreigners-in-ancient-egypt-9781474241601/ .... again there are thousands of depictions of foreignors in tomb paintings. Rarely kind.

If you're looking for books, search it yourself. All of this info I found in seconds.