1. Don’t conclude berachah with two subjects The Gemara explains that we don’t conclude a berachah with two subjects because we don’t perform .אין עושין מצות חבילות חבילות – bundles in mitzvos For example, we don’t conclude the berachah of Birkas Hamazon with ירושלים בונה) Builder of Yerushalayim) and ישראל מושיע) Savior of Israel). 2. Forgetting ויבא יעלה of Rosh Chodesh in tefillah and birkas hamazon Rav Nachman explains logically why when one forgets to say ויבא יעלה in his Rosh Chodesh tefillah he must repeat it, but when he forgets to say it in Rosh Chodesh bentching, he doesn’t repeat it: • Tefillah is obligatory, so it must be repeated with the proper mentioning of Rosh Chodesh. • Eating bread on Rosh Chodesh is not obligatory, so there is no need to repeat bentching if יעלה ויבא was forgotten. 3. Minimum amount of bread to be obligated in joining a zimun The Gemara explains the machlokes between R’ Meir and R’ Yehudah regarding the minimum amount of bread one must eat to be obligated in joining a zimun. • R’ Meir says it’s a כזית ,because he interprets ואכלתas referring to אכילה and ושבעתas referring to שתיה ,and the minimum shiur for אכילהis a כזית . • R’ Yehudah says it’s a כביצה ,because he interprets the words ושבעת ואכלתtogether as referring to שביעה בה שיש אכילה) the eating of an amount that satiates), which is a כביצה . Siman – Meat/Butcher The extremely generous butcher sent bundles and bundles of mitzvah meat and כביצים of bread for the זימוןat the Yeshiva’s Rosh Chodesh party because they never forget to say ויבא יעלה in the bentching.