Amud 12b

תוס' ד"ה כל

Whoever is dealt with badly will not soon be dealt with favorably - כל המריעין לו לא במהרה מטיבין לו

Summary:
רב אחא מדיפתי initially hoped that he would regain his position as ראש ישיבה.

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תוס' ד"ה חלק

We give him his portion as a בכור and his portion as an ordinary son on one boundary - חלק בכור וחלק פשוט יהבינן ליה אחד מצרא

Summary:
The פסוק of פי שנים teaches that both shares of the בכור must be adjoining.

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תוס' ד"ה אמיצרא

By the boundary of בי נשא, etc. - אמיצרא דבי נשי

Summary:
בי נשי can either mean his father-in-law, or his father.

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תוס' ד"ה כגון

In this for instance we constrain him from acting in the manner of סדום, etc. - כגון זה כופין על מדת סדום

Summary:
There is no כופין עמ"ס by a בכור (and a יבם) since it is like two brothers who want to deny the third brother his rights to a lottery, or because בכורה is a מתנה where there is no כופין. Alternately the rule of כופין עמ"ס is only מדרבנן and a בכור receives his two portions אחד מצרא מדאורייתא.

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תוס' ד"ה מעלינן

We raise its assessment as the estates of בר מריון, etc. - מעלינן ליה כנכסי דבר מריון

Summary:
רש"י maintains מעלינן is applicable only for a בית הבעל, but not by a בית השלחין. However תוספות maintains that מעלינן merely means that we do not want to release our rights to this field unless we receive a high price for it. מעלינן cannot override having one’s (initial) parcel אחד מצרא.

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