Responsa for Shabbat 266:4
ממאי עד כאן לא קאמר ר' ישמעאל בנו של ר' יוחנן בן ברוקה התם משום דלא בעינן (שמות טו, ב) זה אלי ואנוהו אבל הכא דבעינן זה אלי ואנוהו הכי נמי
but here that we require, 'This is my God, and I will adorn him',<span class="x" onmousemove="('comment',' The cutting away even of the shreds which does not invalidate circumcision is nevertheless an adornment thereof ');"><sup>6</sup></span> that indeed is so!<span class="x" onmousemove="('comment',' And may be permitted even by R. Ishmael. ');"><sup>7</sup></span>
Binyan Tziyon
That which you have written, namely, that you treat as forbidden wine that has been touched by a Jew who publicly desecrates Shabbat as he is an apostate against the entire Torah, proving this assertion from Responsa Mabit as cited in Nekudot Ha-kesef on Yoreh De’ah (124:2), which forbids the drinking of wine touched by Karaites as they desecrate the festivals, which makes them tantamount to Shabbat desecrators—indeed, there is someone who disputes this, and you therefore ask me for my opinion in this matter.
Ask RabbiBookmarkShareCopy