Halakhah su Deuteronomio 25:9

And it is clear that the priest taking that which he may take is one of the parts of the commandment, as we mentioned with the hide of the burnt-offering. Likewise the first shearings - the whole commandment, is that we separate it and [then] give it to the priest - and likewise the tithe that we give to the Levite. But they have already erred about this, such that they have counted the gifts to the priesthood as a commandment after they have counted some of the commandments that those gifts were a part of - as we explained with the hide of the burnt-offering, and the breast and the thigh of the peace-offerings. And because this principle was hidden from others besides us and they were not aware of it all and they did not comprehend it - they came to counting pouring, mixing, crumbling, salting, presenting, waving and incinerating as separate commandments; and they did not know that they were all parts of the process of the grain-offering. And that is that we were commanded the grain-offering; and afterwards He explained about this topic that was mentioned and what it is about - and that is the precept of the grain-offering. And He said that it should be from fine flour and from bread that is made according to this description or that description - meaning [in] a pan, or a deep-pan or baked in an oven - that it be mixed in oil according to a certain measure, crumbled, that salt and frankincense is put upon it, that it is presented, waved, some of it is taken and incinerated, according to the facets that were explained in Tractate Menachot. But these are all parts of the process. And the matter that follows this whole description is called a grain-offering. If so, the commandment is the command that the process of the sacrifice of bread or of fine flour be that we offer it completely according to this arrangement. And similar to these things in the commandment of the grain offering - meaning its pouring, its mixing, its crumbling, its salting, its presenting, its waving and its incinerating - is His, may He be exalted, saying about chalitsah, "and she shall remove his shoe, spit in front of him, and declare and say" (Deuteronomy 25:9). And just like the commandment of chalitsah is one and we do not count chalitsah (removing the shoe) and spitting [separately] - since it is their combination, which is the process of chalitsah, that is one commandment - so too, would we not count [separately], "and you shall pour oil upon it," "and he shall place frankincense upon it," "you shall surely salt it," "and he shall wave" and "and he shall incinerate." And this would only be hidden from someone who bases his words on his first impressions without [further] analyzing them - as the Sages, may their memory be blessed, say, "He said it on the run" - meaning it was said without observation, but rather what first came to his mind. And this principle [relates to] the commands of the sacrifices and how it is appropriate to count them, such that no new mistakes or confusion creep in at all - as we have explained.

"And the yevama shall approach him" (Deuteronomy 25:9), and loosens the knots of the shoe with her right hand, without the assistance of the left. She then opens the clasps, the lowest one first [and proceeding to the top]. She grasps his foot with her left hand, lifts it from the floor, removes the shoe from the heel, and takes off the entire shoe using her right hand without assistance from the left, and without assistance from the yavam, whether from his hand or his leg, and throws the shoe to the ground, at some distance. The yevama remains standing throughout this procedure, bent over but not sitting or kneeling. The Rabbi tells her to gather a large quantity of spittle in her mouth, not a yawn or a sneeze. She should not spit plain water, but only actual spittle.

They narrate to her in Hebrew [and she says]: "Thus shall be done to the man who will not establish his brother's house, and it shall be named in Israel the house of the shoe removal" (Deuteronomy 25:9-10). [They repeat] "the house of the shoe removal, the house of the shoe removal".