Responsa for Yevamot 227:11
אבא שאול אומר נוהגין היינו שיונקים מבהמה טהורה ביום טוב: היכי דמי אי דאיכא סכנה אפילו בשבת נמי ואי דליכא סכנה אפילו ביום טוב אסור לא צריכא דאיכא צערא
— [Permissibility for] an adult is dependent on medical opinion.<span class="x" onmousemove="('comment',' Lit., 'requires an estimate'. Before he is allowed to eat of the forbidden food it is necessary to obtain medical opinion that delay until the conclusion of the Sabbath, for instance, would involve him in danger. ');"><sup>46</sup></span> [Permissibility for] a child also should be made dependent on medical opinion!<span class="x" onmousemove="('comment',' Cf. supra n. 11. ');"><sup>47</sup></span> — R. Huna son of R. Joshua replied: The ordinary child is in danger when deprived of his<span class="x" onmousemove="('comment',' Lit., 'at'. ');"><sup>48</sup></span> milk. 'Abba Saul stated: It was our practice to suck from a clean beast on a festival'. How is one to understand this?<span class="x" onmousemove="('comment',' The circumstances in which Abba Saul and his friends were permitted to commit an apparently forbidden act. ');"><sup>49</sup></span>
Teshuvot Maharam
SOURCES: L. 140.
Teshuvot Maharam
A. Lending charity-funds on condition that the lender share in the profits but not in the losses, is forbidden. The Rabbis who said (B. M. 70a) that a person lending money on such a condition is called "wicked" made no distinction between rich and poor. Since a poor person is not permitted to lend his money on condition that he share in the profits but not in the losses, we are not permitted to do so for him.
Teshuvot Maharam
A. Lending charity-funds on condition that the lender share in the profits but not in the losses, is forbidden. The Rabbis who said (B. M. 70a) that a person lending money on such a condition is called "wicked" made no distinction between rich and poor. Since a poor person is not permitted to lend his money on condition that he share in the profits but not in the losses, we are not permitted to do so for him.
Note: The following introduction precedes the answer: Please excuse me for the brief response. For the last two weeks I have been confined to bed and have lost the taste for food. I wrote to you a lengthy response regarding the lending of charity-funds, and sent it to you through a messenger named Marvel. I forgot the lengthy argument and discussion. I remember, however, to have agreed with your reasons and arguments, and to have added the following ….
SOURCES: L. 425; P. 476. Cf. Agudah B.M. 73.