1
vote
1answer
67 views

Can a father dissown his oldest son and make his younger son the bachor?

It is well known Esav sold his 'birthright' to Yaakov. Can a father decide arbitrarily which son he wants to favor as his bachor? If so -under what conditions?
1
vote
2answers
115 views

Fasting for a child bechor before Passover

I've heard that some men fast on erev Pesach for their firstborn son until that son old enough to fast for himself. Is that halakha? Where does this come from?
21
votes
3answers
440 views

Must a jew-by-choice who is a firstborn observe the fast of the firstborn

I'm interested in the question of whether a ger who is firstborn (of both parents, say, to keep things simple) must follow the rules for Ta'anit B'khorot. There are some remarks on the wikipedia page, ...
7
votes
2answers
171 views

Why isn't Ta'anit Bechorot pushed back to Thursday when Pesach falls out on Shabbas?

When the first Seder falls on Motzei Shabbas, Ta'anit Bechorot is pushed back to Thursday. Why does it stay on Friday when Pesach falls out on Shabbas?
8
votes
1answer
187 views

First-born animals today

From what I understand, the laws of "bechor behemah tehorah" (kosher first-born animal) are still in effect today, both in Israel and outside. To avoid problems with this, we sell a share of the ...