Wikipedia quoting a well-researched piece on Mondoweiss:
Earlier iterations of the slogan in Arabic included explicitly Islamist and Arab nationalist sentiments; one early version translates to “‘From the river to the sea’ … or ‘from the water to the water, Palestine [is] Islamic,’” Colla said. “Maybe a more common version is, ‘Palestine is Arab.’”
So, there you have it.
Arabs, whether Jewish or Cursedian or Mohemadan can all share the land, just get rid of those Ashkenazi elitist colonizers! The Sefardic Shas movement (or better yet, the Israeli Black Panthers) could have used the same slogan!
Note: Only kidding, of course. The non-Jewish Arabs don’t view Arab Jews as Arab any more than European non-Jews accepted Jews as European (the same is true for almost any other country as regards its Jews). So “Arab” means non-Jewish Arab.