For the elimination of שאור was compared to eating חמץ, etc. - דהא איתקש השבתת שאור לאכילת חמץ וכולי
Summary:
The היקש of חמץ to השבתת שאור is only regarding the חיוב השבתה during פסח. However, תוספות remains with a difficulty; why do we not derive an עונש כרת for השבתת שאור from the עונש כרת of אכילת חמץ, through this same היקש?
As the academy of רבי ישמעאל taught - כדתנא דבי רבי ישמעאל
Summary:
The meaning of בזכות ג' ראשון is in the זכות of the three מצות where the word ראשון appears (many times). The תנא דבי ר"י is referring to the מצות (where the word ראשון appears) that are written in פרשת המועדות which begins and ends with מקרא קודש.
Summary:
One is עובר the לאו of לא תשחט if he is in possession of חמץ when his פסח is נשחט; however (logic dictates that) the חיוב of תשביתו begins from חצות onwards.
And the תורה states; ‘You shall not perform any work’ - ואומר כל מלאכה לא תעשו
Summary:
One may not burn חמץ on יו"ט if he does not intend to use the coals later for אוכל נפש. Alternately one may not burn חמץ on יו"ט (even though that he intends later to use the coals for cooking), for since initially he cannot use it for אוכל נפש, it is prohibited.