[Avodah] Minhag Yisroel

[David Riceman]

Rich, Joel wrote:
> "kabalas herem hala aleihem ve'al zaram ..." - SA YD 214:2 "nidui
> ve'herem hal al doros ha'ba'im" - ibid 228:35
>
>
>   
> Sorry for the lack of clarity - this din (which iiuc is based on the
> gemara in Pesachim 50b) is based on a pasuk in mishlei(Shma bni
> musar..). So my question was, what is the makor, as in is this an
> offshoot of a neder, is it halacha moshe misinai, is it a gezeira of the
> rabbanan.....?
>
>   
See Hayyei Adam Klal 127, especially s'ifim 11-12.

David Riceman