Responsa for Eruvin 77:5
עירב בפת בראשון מערב ברגליו בשני עירב ברגליו בראשון אין מערב בפת בשני שאין מערבין בתחלה בפת
[To turn to] the main text: Rab Judah ruled: If a man prepared an 'erub for the first day with his feet he must also prepare it for the second day with his feet and if he prepared the 'erub for the first day with bread he must also prepare it for the second day with bread; if he prepared his 'erub for the first day with bread [and it was lost] he may prepare it for the second day with his feet, but if he prepared it for the first day wi his feet he may not prepare it for the second day with bread because It is not allowed [on a festival day] to prepare for the first time an 'erub [for the Sabbath] with bread.<span class="x" onmousemove="('comment',' Since the 'erub would have to be Named on the festival day the prohibition against performing an act on a festival for the Sabbath would be infringed.');"><sup>11</sup></span> 'If he prepared the 'erub for the first day with bread he must also prepare it for the second day with bread'. Samuel explained: But only with the same bread.
Teshuvot Maharam
A. The decision of the teacher is incorrect, for ordinarily whatever a Jew is not allowed to do on the Sabbath, he is not permitted to tell a Gentile to do.
This Responsum is addressed to R. Nathan, an uncle of R. Meir. But according to Cr. 20, it was sent to R. Hezekiah of Merseburg.
SOURCES: Cr. 20; Pr. 637; Wertheimer 15; Mord. Shabb. 314; Hag. Maim., Shabbat 6, 9.