Rif Shabbat 20b

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20b

{Shabbat 42b continues}
for it is forbidden to nullify a vessel from its designated use, but he may overturn a vessel over it so that it does not break.

{Shabbat 43b}

It was said {by Amoraim}:
If a dead man is lying in the sun -
Rav Yehuda cited Shmuel: It may be changed over from bier to bier {until it reaches the shade}.
And Rav Chanina bar Shelemya {our gemara has just Rav Chanina} cited Rav: A loaf or a child is placed upon it, and then move it.

When there is a loaf or a child, all agree that it is permitted.
When there is not - one holds that moving from the side {moving indirectly, by changing over from bier to bier} is called moving, and one holds that it is not called moving.

Let us say that this {dispute} parallels that of Tanaim:

A corpse may not be rescued from a conflagration {on Shabbat}.
Rabbi Yehuda ben Lakish said: I have heard that a corpse may be rescued from a fire.

How so?
If there is a loaf or a child, what is the reason of the first Tanna who said it is forbidden?
And if there is no loaf or child, what is the reason of Rabbi Yehuda ben Lakish who permits?
Rather, in moving from the side they are arguing - that one holds that moving from the side is called moving, and one holds that it is not called moving.

No. All agree that moving from the side is called moving, and this is the reason of Rabbi Yehuda ben Lakish: since a man is agitated over his dead, if you do not permit to him this moving, which is Rabbinic in origin, he will come to extinguish [the fire], which is Biblical in origin.

{Shabbat 44a}
Rav Yehuda bar Shela cited Rabbi Yochanan: The halacha is like Rabbi Yehuda ben Lakish in terms of a corpse.

And we deduce from this that moving from the side is called moving, (and this is the reason of Rabbi Yehuda - ) that the Sages only permitted it by a corpse, so that he does not come to violate a Biblical prohibition, but in general, it is forbidden.

And it is difficult for us, for we learn in perek kol haKeilim {perek 17, Shabbat 123a} regarding an unripe fig that was hidden in straw, or a cake which was hidden in live coals, if part thereof is uncovered, it may be handled {moved}. Eleazar ben Taddai says: One impales them on a reed or a whorl, and they [the straw or coals] are shaken off of their own accord. Rav Nachman said: The halacha is like Eleazar ben Taddai, who holds moving from the side {or - indirect handling} is not called moving.

And we answer: When is moving from the side called moving? These words are said regarding stones and the like, which are not for the purpose of Shabbat, that it is forbidden to move them from place to place, similar to a corpse, as we say there, one {an infant} of eight months who is alive {pregnancy} is like a stone, that it is forbidden to move him {on Shabbat}, for he is like a corpse. But an unripe fig that was hidden in straw, or radish or a cake which was hidden in hot ashes, or the like, which are foods, that one needs to eat them on Shabbat, moving from the side in all of these matters is not called moving.

"YET ONE MAY NOT BENEFIT FROM IT, BECAUSE IT IS NOT OF THAT WHICH IS PREPARED":
The Sages learnt {in a brayta}: The remainder of the oil in the lamp and the dish, it is forbidden to draw from it, and Rabbi Shimon permits.

MISHNA:
A NEW LAMP {which has never been used} MAY BE HANDLED, BUT NOT AN OLD ONE, THESE ARE THE WORDS OF RABBI YEHUDA. RABBI MEIR SAYS: ALL LAMPS MAY BE USED