I see him, but not now; I behold him, but not near; a star shall tread from Yaakov, and a scepter shall rise from Israel, and shall smite the corners of Moav and undermine all the sons of Sheth.
Torah Temimah: Yerushalmi Nedarim 3:1 — the star rises from Yaakov, not from elsewhere.
Sefaria — Yerushalmi Nedarim 3:1
English: It was taught: R. Gershon in the name of R. Acha says: “A star shall tread from Yaakov” — from whom does a star tread, and from whom is one destined to arise? From Yaakov.
Restrictive reading tying the star exclusively to Yaakov’s line.
The messianic star is not from Yishmael or Esav — only from Yaakov, as already hinted to Avraham in counting the stars.