Talmud for Pesachim 168:8
רב פפא אמר כל כי האי גונא כ"ע יש בו משום שבירת העצם מאי טעמא לאורתא מיחזי לאכילה אלא באבר שיצא מקצתו קמיפלגי מ"ד כשר הא כשר הוא ומ"ד ראוי לאכילה האי לאו בר אכילה הוא
Why [may one register for] the marrow in the head? Because one is able to scrape it and extract it.
Jerusalem Talmud Pesachim
If he broke a bone of it when it still was daylight. There are Tannaim who state, he is liable, and there are Tannaim who state, he is not liable51Babli 84b.. He who says that he is liable, do not break a bone in it52Ex. 12:46. etc., in any case. But he who says that he is not liable, at a time when he is not obligated to eat fire-roasted there is no do not break a bone in it; at a time when he is obligated to eat fire-roasted there is do not break a bone in it.
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