"No stranger may eat of it": Both a heretical Jew and a non-Jew are herein subsumed, viz. (Ezekiel 44:9) "And every stranger, uncircumcised of flesh and uncircumcised of heart shall not enter My sanctuary.
No Stranger May Eat the Passover - Not Heretics and Not Gentiles
Mekhilta Tractate Pischa 15:3