וַיָּסִ֨ירוּ הָעֹלָ֜ה לְ֠תִתָּם לְמִפְלַגּ֤וֹת לְבֵית־אָבוֹת֙ לִבְנֵ֣י הָעָ֔ם לְהַקְרִיב֙ לַיהוָ֔ה כַּכָּת֖וּב בְּסֵ֣פֶר מֹשֶׁ֑ה וְכֵ֖ן לַבָּקָֽר׃
E rimossero le parti da ardere [sull'altare], per darne [le porzioni di carne] alle divisioni delle case paterne dei figli del popolo, e per offrirle al Signore, come è scritto nel libro di Mosè. E così fecero con i buoi.
Rabbeinu Bahya
ובשלת ואכלת, “you are to boil it and eat it.” The word ובשלת in this connection means “to barbecue it on a spit over an open fire” as we know already from Exodus 12,8. The word בשל occurs in the sense of “ripening, becoming ready for its destiny,” already in Genesis 40,7 when the butler described his dream with the grapes. Similarly, the meaning of Chronicles II 35,13 ויבשלו את הפסח, does not mean that the people boiled the Passover in water, but that they made it ready for eating.