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Ibn Ezra on Exodus 23:18/אבן עזרא על שמות כ״ג:י״ח

אדם זבחי. הוא זבח חג הפסח הנאכל על מצות ומרורים:
1THE BLOOD OF MY SACRIFICE. The reference is to the sacrifice of the paschal offering, which is eaten with unleavened bread and bitter herbs.
בחלב חגי. הוא שה תמים שהוא חיוב, וכן כתוב "בהעלות העולה והחלבים" (דה"ב לה יד) עד הבקר:
2THE FAT OF MY FEAST. The reference is to the unblemished lamb81 and the fat of My feast refer to the same animal. which one is obligated to offer. It is similarly written, in offering the portions that were to be burnt and the fat till the morning (II Chron. 35:14).82. It is possibly a scribal error. On the other hand, I.E. may have quoted from memory and erred. If I.E. quoted the verse properly, then he is offering proof from Chronicles that the fat of offering was not allowed to remain overnight (Krinsky). In his short commentary, I.E. explains that the fat of the paschal lamb could be burnt till the morning because of the many sacrifices offered. He quoted II Chron. 35:14 to illustrate the normal procedure.