t’s unclear what passage of the Qur’an this charming lad has in mind. The Qur’an does say “Kill them wherever you find them” (2:191, 4:89, cf. 9:5), but those exhortations aren’t specifically directed at Jews.
Outside of the Qur’an, there is a famous hadith depicting Muhammad as saying that the end times will not come until Muslims kill Jews: “The last hour would not come unless the Muslims will fight against the Jews and the Muslims would kill them until the Jews would hide themselves behind a stone or a tree and a stone or a tree would say: Muslim, or the servant of Allah, there is a Jew behind me; come and kill him; but the tree Gharqad would not say, for it is the tree of the Jews.” (Sahih Muslim 6985)
In any case, whatever passage he has in mind, there is no doubt that this young man believes what he says, and intends to act upon it.