In the 1960s and 70s it became the signature phrase of the Palestine Liberation Organization to indicate the replacement of the State of Israel with a State of Palestine extending “from the river to the sea,” including the expulsion of Jews.

Hamas have since called for the expulsion of all Jews.

Hamas proclaims it in its 1988 founding, charter document, The Hamas Covenant. The second paragraph declares to all the world that, “Israel will exist and will continue to exist until Islam will obliterate it, just as it obliterated others before it.” The introduction section promises “[o]ur struggle against the Jews is very great and very serious” and will only end when “the enemy is vanquished and Allah’s victory is realized,”

https://www.ajc.org/translatehate/From-the-River-to-the-Sea