Responsa for Shabbat 288:8
רב פפא אמר משום דהוי דבר שאין עושין ממנו מקוה לכתחילה וכל דבר שאין עושין ממנו מקוה לכתחילה פוסל את המקוה בשינוי מראה
it renders the mikweh unfit on account of changed appearance.<span class="x" onmousemove="('comment',' The water is stained red and no longer looks like water. ');"><sup>14</sup></span> But these are not normally expressed?<span class="x" onmousemove="('comment',' Hence their juice should be of no account. ');"><sup>15</sup></span>
Maharach Or Zarua Responsa
R. Hayyim Eliezer corresponded with his son and discussed whether a Jew is permitted to benefit from work that was performed by a Gentile on the Sabbath, or holidays, as well as work done by a Jew on these days under certain extenuating circurastances.
R. Hayyim Eliezer recalls that one time, the winterhouse was once heated by a Gentile on the Sabbath, and his father refused to eat therein. R. Samuel of Falaise in the name of R. Yom Tov permitted one to dwell in a winterhouse that was warmed by a Gentile on the Sabbath. In our city, most of the people rely upon this decision and dwell in winterhouses that are warmed by Gentiles on the Sabbath.
R. Hayyim Eliezer recalls that one time, the winterhouse was once heated by a Gentile on the Sabbath, and his father refused to eat therein. R. Samuel of Falaise in the name of R. Yom Tov permitted one to dwell in a winterhouse that was warmed by a Gentile on the Sabbath. In our city, most of the people rely upon this decision and dwell in winterhouses that are warmed by Gentiles on the Sabbath.
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