Rif Shabbat 66b {Shabbat 153b continues ... 154b}

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66b
{Shabbat 153b continues}

{Shemot 20:9}

ט וְיוֹם, הַשְּׁבִיעִי--שַׁבָּת, לַה אֱלֹקֶיךָ: לֹא-תַעֲשֶׂה כָל-מְלָאכָה אַתָּה וּבִנְךָ וּבִתֶּךָ, עַבְדְּךָ וַאֲמָתְךָ וּבְהֶמְתֶּךָ, וְגֵרְךָ, אֲשֶׁר בִּשְׁעָרֶיךָ.

9 but the seventh day is a sabbath unto the LORD thy God, in it thou shalt not do any manner of work, thou, nor thy son, nor thy daughter, nor thy man-servant, nor thy maid-servant, nor thy cattle, nor thy stranger that is within thy gates;

{So how could we tell him to place the purse on his donkey}?
Rav Ada bar Ahava said: He places it upon her while she is walking. {If one places a burden on a man while he is walking he is not culpable, because there is no 'removal' in a technical sense; Hence it does not constitute labor.}
But it is impossible that she shall not stop in order to urinate or defacate,and so there is removing and depositing {involved in regard to the purse}?
Rather when she is walking he places it upon her, and when she stops he removes it from her.

Rav Ada bar Ahava said: If one's bundle is lying on his shoulder, he must run with it until he arrives home. He may only run, but not walk leisurely. What is the reason? — Since he has nothing to mark a distinction, he will come to perform removing and depositing. Yet after all, when he arrives at the house it is impossible that he shall not stop for a moment, and so he carries it from public to private ground? — He throws it in a 'back-handed manner.'

{Shabbat 154b}
"WHEN HE REACHES THE OUTERMOST COURTYARD...":
Rav Huna said: If his animal is laden with glassware {which would break if they fell} -- such as surgeon's horns {used for letting blood}, which are forbidden to handle because they are not fit for him -- he brings mattresses and pillows, places [them] under it, unties the cords, and the sacks fall off. And this is specifically small bags {pillows and mattresses} such that if he wishes to remove the mattresses he may {without breaking the glassware, which now has a short distance to fall and thus will not break} and thus he does not nullify a utensil {the pillow and mattress} from its readiness {for use, which would be forbidden}.

From this we deduce that the halacha is not like Rabbi Yitzchak who said in perek Kira {Shabbat 43a} that a vessel may be handled only for the sake of that which itself may be handled on Shabbat. For here we are dealing with a surgeon's horns, which are not fit {for him} and we say that he should bring a pillow or a mattress and place it under them.

They learnt {in a brayta}: Rabbi Shimon ben Yochai says: If the animal is laden with a bag of grain {of tevel} one places his head under it and moves it to the other side, so that it falls off automatically.