Gemarah 1
When is the zman to put on Tefillin? (Explain)
Alos/amud hashachor when one can recognize his friend from 4 Amos away.
So he won't be מסיח דעת (forget about the tefillin)
In order to guard them.
Milk that a goy milked without a yid watching.
Maybe he mixed in milk from a non kosher animal.
If רבה says one can wear tefillin at night why can't one wear tefillin on shabbos?
He excludes shabbos from the word אות like .ר' עקיבא
How can one say רב נחמן said the halacha is not like ר' יעקב if רב חסדא and רבה wore tefillin for Maariv?
According to that opinion רבה Argues with רב נחמן
From the time of day that you're able to put on Tefillin .
It's a גזירה דרבנן therefore we are always מחמיר.
חשש דאורייתא
גזירה דרבנן
Any time it says in the pasuk השמר פן or אל it's a לא תעשה.
Rebbi Elezar says he is עובר a עשה and ר' יוחנן says he is עובר a לאו.
He held the halacha is one may wear tefillin at night but we don't teach it.
Yes but today that one has to also check if it's a traifa only an expert can supervise the milking.
What is the din of a כלי that חלב עכו"ם was cooked inside?
It's אסור even though it's only a ספק if it's not kosher.
How can we say that רבה holds one can wear tefillin at night if he himself said that if it's a ספק if it's day or night one doesn't have to take off his tefillin but one cannot put on tefillin which implies that if it's actually night one cannot put on tefillin?
That din of רבה is referring to Friday Bain Hashmoshos but on a regular night on May wear tefillin.
There's a few pesukim that say "hand and right hand" implying that hand on its own is the left hand.
T"K Shekiah, ר' יעקב tzais, חכמים before one goes to sleep
If it's only a חשש דאורייתא then in a situation that there's nothing to worry about for example there's only kosher animals it will be מותר to buy milk from a goy but if it's a גזירה דרבנן then regardless of the situation we are מחמיר.
If theres no worry for non kosher animal's there then even if he's not there at all it's kosher but if there's a "kloster" between the yid and the cows then it's as if the milking is in a non Jewish house.
What's the source that one has to touch his tefillin all the time?
Kal vachomer from the ציץ if the ציץ which only says hashems name once it says והי'ה על מצחו תמיד meaning one cannot be מסיח דעת (forget) about the ציץ Kal vechomer to tefillin which says hashems name many times one cannot forget about it.
Machlokes ר' יוסי from "מימים" the extra "מ" teaches us weekdays and not shabbos ר' עקיבא learns it out from "והי'ה לאות" only a day that need on אות this excludes shabbos and Y"T which the day itself is a אות.
ר' אלעזרHold “השמר" regarding a לא תעשה is a לא תעשה but a "השמר" regarding a עשה is a עשה and in our case the "השמר" is regarding a עשה and ר' יוחנן holds regardless "השמר" is always a לא תעשה.
L'chatchilah Watch from the beginning of the milking process and make sure there was no non kosher milk in the keli he was milking into.
בדיעבד if there's no non kosher animals there even if he outside it's fine if there is non kosher animals there then 1) if the goy is milking for the yid and 2) he knows that non kosher milk is asur for a yid then if the yid is able to see him when he stand up even if he's sitting it's kosher because the goy is scared maybe he'll stand at any moment.
1. Anything that was decreed by the sanhedrin even if the reason doesn't apply now we cannot annule.
2. All the gzairos had other reasons which the sanhedrin didn't say so even if this specific reason doesn't apply others may.
3. These days in order to heal a common stomach problem they make the animal a traifa so one needs to check this out before drinking milk.