Halakhah su Levitico 25:46

And these laws that we wrote are only said about one who purchased from a trader. But [regarding] one who buys from a homeowner, there is no [overcharging] in it and no nullification of the sale within the set time that we said nor afterwards. As these things were only said with traders for the improvement of the world and the settlements of the states. But homeowners only sell expensively - and in their knowing the matter that it is like this, people always forgive the matter with a homeowner. And these are the things (Bava Metzia 56a) that do not have the laws of [overcharging] for anyone, and even if they were sold for twice their worth - and even though there is a prohibition of [overcharging] about them, according to the opinion of Ramban, may his memory be blessed: lands; slaves - since they were compared to lands, as is learned in the Gemara (Bava Metzia 56b), from that which it is written (Leviticus 25:46), "And you shall inherit them"; deeds; and consecrated properties. And [it is] as they, may their memory be blessed, said, "'And if you sell, etc. or buy from the hand' - something that is acquired from a hand to a hand; [so] lands are excluded, as they are not movable items. Slaves are excluded, as they are compared to lands. Deeds are excluded, as Scripture stated, 'a sale' - that which it, itself, is sold; [so] deeds are excluded, as they are not sold themselves and they are not acquired themselves, but only for the proof in them. From here they said, one who sells his deeds to a perfumer has [the possibility of overcharging]." And the reason is because they do not sell it to him for the proof in them, but rather to use the paper. And it wonders about this in the Gemara, "What do we understand from it?" - meaning, isn’t this obvious; is paper worse than any other thing? And it answers, "To exclude from that of Rav Kahana, as he says, 'There is no [overcharging] for perutot (the smallest coins) [and things of similar value].'" Consecrated property is excluded from the law of overcharging, from that which it is written, "your countryman."

The commandment of work with a Canaanite slave forever: That we have a Canaanite slave work forever, meaning that we should never manumit him; and he should only go free for [suffering the loss of] a tooth or limb, as it appears in Scripture (Exodus 21:26-27) - or from the main limbs that are similar to them, meaning limbs that do not grow back, as the accepted traditional explanation comes about this (Kiddushin 24a) - as it is stated (Leviticus 25:46) "you shall work them forever." And they, may their memory be blessed, said (Gittin 38a), "Rav Yehudah said, 'Anyone who manumits his slave is in violation of a positive commandment, as it says, "you shall work them forever."'" And [any] one from all of the [other] nations who was acquired by a Jew as a slave is called a Canaanite slave. But all slaves are attached with the name, Canaan, because Canaan was cursed to be a slave - he and his progeny - forever. And even though this section in which we were commanded to subjugate them is speaking about Canaanites - as it is written (Leviticus 25:44), "from the peoples that surround you may you purchase a slave or maid-servant," and it is written earlier (Leviticus 25:38), "to give to you the Land of Canaan" - it was known to the Sages, may their memory be blessed, that it was not only Canaan and those in their land that were called Canaanite slaves. As the law is the same for all the rest of the nations - that they have the status of a Canaanite slave in every matter.

It is from the roots of the commandment [that] since the people of Israel are the choicest of the human species and they were created to recognize their Creator and to serve in front of Him, it is fitting that they should have slaves to serve them. And if they do not have slaves from the nations, they would nonetheless need to subjugate their brethren, and [those subjugated] would be unable to strive in His service, blessed be He. We were therefore commanded to retain these for our use - after they have been readied and have had idolatry removed from their mouths, lest they be a snare in our homes. And this [is the meaning of] the verse afterwards (Leviticus 25:46), "and as for your brothers, the Children of Israel, a man shall not subjugate his brother." That is to say that with this, you will not need to subjugate your brethren and you will all be prepared for the service of God. And even though the understanding of the verse is to warn not to subjugate a Hebrew slave with oppressive labor, there are seventy face to the verses.