Question: We hold that an Aseh overrides a Lav. We should learn from here that it does not!

Suggestion: Perhaps Isurim of Shabbos are more stringent than regular Lavin.

Rejection: The following Tana does not distinguish!

(Beraisa) Suggestion: If a father told his son (a Kohen) to become Tamei (Mes), or not to return a lost object, perhaps he should obey!

Rejection: "A man will fear his parents, and keep My Shabbosos" - you are all obliged to honor Hash-m.

Answer: Hechsher Mitzvah is different. (Tosfos - the Mitzvah of Kibud is giving food to a parent. Hechsherim, i.e. means to this end, do not override Lavin. Rashi - really, the father told the child to slaughter or cook. If not for the verse, this would override Shabbos, for Hechsher Mitzvah, i.e. what is inevitable for fulfillment of a Mitzvah, overrides even Kares. Transgressing Eshes Ach is not inevitable. One can do Chalitzah instead!)

Answer #2 (to Question #1, Daf 3b): We would have learned from Binyan Beis ha'Mikdash that a Mitzvah with Kares is overridden:

(Beraisa) Suggestion: Perhaps Binyan Beis ha'Mikdash overrides Shabbos!

Rejection: "Keep My Shabbosos and fear My Mikdash" - you are all obliged to honor me.

Suggestion: We would have thought that building and destroying are allowed, if not for the verse.

Rejection #1: No, the suggestion was to permit Mechamer. The verse rejects this.

Question: We hold that an Aseh overrides a Lav. We should learn from here that it does not!

Suggestion: Isurim of Shabbos are more stringent than regular Lavin.

Rejection: The following Tana does not distinguish (he learns other Isurim from Shabbos)!

(Beraisa) Suggestion: Perhaps if a father told his son (a Kohen) to become Tamei, or not to return a lost object, he should obey!

Rejection: "A man will fear his parents, and keep My Shabbosos" - you are all obliged to honor Hash-m.

Version #1 (Tosfos) Answer: The Beraisa teaches that Hechsher Mitzvah does not override a Lav. (The Mitzvah, giving him to eat, is after he transgressed the Lav.)

Version #2 (Rashi) Rejection #2: (Really, it discusses building and destroying. If not for the verse, this would override Shabbos, for) these are Hechsher Mitzvah. (In this case, one cannot fulfill Kivud Av v'Em without transgressing the Lav. We cannot learn to Yibum, which is not Hechsher Mitzvah, for one can do Chalitzah. end of Version #2)

Question: We already learned Hechsher Mitzvah from there (honoring parents, does not override a Lav - 1:a:1)! (Rashi - why did the Torah teach also about Binyan Beis ha'Mikdash? Rather, it is to teach that even without Hechsher Mitzvah, an Aseh overrides a Lav with Kares!)

Answer: True; our verse comes to teach the following.

(Beraisa) Suggestion: Perhaps a person should fear the Mikdash!

Rejection: "Keep My Shabbosos and fear My Mikdash" discusses guarding Shabbos and fearing the Mikdash. We fear the One who commanded to keep Shabbos, not Shabbos itself. Similarly, we fear the One who commanded about the Mikdash, but not the Mikdash itself.

Question: What is fear of the Mikdash?

Answer: A person does not enter Har ha'Bayis with his staff, shoes, money-belt, or dust on his feet. He may not make it a shortcut; all the more so, he may not spit.

Suggestion: Perhaps this applies only when the Beis ha'Mikdash stands!

Rejection: "Keep My Shabbosos and fear My Mikdash" - just like observing Shabbos applies forever, also fear of the Mikdash.

Answer #3 (to Question #1): We would have learned from Misas Sereifah that a Mitzvah with Kares is overridden:

(Beraisa - Tana d'Vei R. Yishmael) Question: What do we learn from "Do not kindle fire in all your dwellings on Shabbos"?

Objection: A Beraisa already teaches this! R. Yosi expounds that burning is only a Lav. R. Noson expounds to be Mechalek (one is liable for each Melachah of Shabbos by itself)!

Clarification (Rava): The Tana asks what we learn from "your dwellings".

Since Shabbos is an obligation of people (not of the land), it applies outside of Eretz Yisrael as well. What do we learn from "in all your dwellings"?

Answer (R. Yishmael) Suggestion #1: Perhaps "When a man is Chayav Misah he will be killed" applies even on Shabbos!

Objection: It says "Mechalelehah (those who desecrate Shabbos) Mos Yumas"!

Answer: That would apply to Melachos other than Misas Beis Din.

Suggestion #2: Or, perhaps "Mechalelehah Mos Yumas" applies even to Misas Beis Din, and "he will be killed" is only on a weekday!

Suggestion #3: Or, perhaps it is even on Shabbos!

Rejection: It says "Do not kindle fire in all your dwellings on Shabbos", and "... judgment... in your dwellings". Just like the latter "dwellings" refers to Beis Din, also the former, and the Torah forbids burning.

Suggestion: The Tana holds like R. Noson, who says that the verse is Mechalek. If not for the verse, we would have said that execution overrides Shabbos!

Rejection: No, the Tana is R. Yosi. (Burning is only a Lav, therefore one might have thought that execution overrides it.)

Question: Even R. Yosi exempts from Kares only burning. Beis Din burns people through melting lead (and pouring it down their throats)!

(Rav Sheshes): Melting lead is like cooking ingredients to make dye (there is Kares for it)!