New International Version
they said, “All right, say ‘Shibboleth.’” If he said, “Sibboleth,” because he could not pronounce the word correctly, they seized him and killed him at the fords of the Jordan. Forty-two thousand Ephraimites were killed at that time.
Judges 12:6
https://biblehub.com/judges/12-6.htm
I am going to guess they are foreigners, have a disability or speech impediment or that is the accent in the community they grew up in or the accent they hear on media
@Justicar
I can not understand a lot of English accents from certain parts of the USA and certain parts of England and English speaking African countries and India and Indian adjacent countries
I only understand the English accent used on the national news in the USA which is the same accent that middle class White people use where I live. I can also understand it when Chinese, Korean and Japanese people speak that type of English but with a Southeast Asian accent