Question:
BH
Hi Rav, I don't know if it's ok to ask you research based questions however I saw that you guys were asked by someone here what seems to be regarding the binding nature of Shavuot and Nedarim by repeatetly doing an action 3 times. [1] I have been told similar that if you do some action at least 3 times you can bind upon your self a neder, or maybe its a chazzaka, or a shavua? What is the source of this though in the Gemara that if you so something three times it might be considered a chazaka or shavua or neder that you have to or should continue it's pattern? Also Is this called creating a custom? And if yes where does it say that customs have binding nature like a shavua or a neder or chazaka? Although, if it is considered chazaka, where does it say that it has the binding nature of a Shavua or a neder?
[1] https://dinonline.org/2021/11/02/nederim-i-might-have-made-by-mistake/
Answer:
Here are some mareh mekomos. See Nedarim 15a, Tur and Shulchan Aruch Yore Deah 214-1.
Best wishes