Halakhah su Deuteronomio 27:6

That is that we were commanded to build a choice house for Divine service, in which there will be sacrifices and an eternal burning of fire; and to which there will be journeying and pilgrimage on the festivals, and gatherings every year. And that is His saying, "And let them make Me a sanctuary" (Exodus 25:8). And the language of the Sifrei (Sifrei Devarim 67:1) is, "Three commandments were commanded to Israel upon their entrance to the land: To appoint a king over themselves; to build themselves a choice house; and to cut off the seed of Amalek." Behold it has been made clear to you that the building of the choice house is a separate commandment. And we have already explained (Sefer HaMitzvot, Shorashim 12) that this aggregate includes many parts, such as the menorah, the table, the altar and the rest of them - all of them are parts of the Temple. And all of it is called, Temple, even as each and every part has an individual command. However, His saying about the altar, "Make for Me an altar of earth" (Exodus 20:21), could have been thought of as a separate commandment, besides the commandment of the Temple. And the content of this is as I will tell you: True, the simple understanding of the verse is indeed clearly speaking about the time of the permissibility of altars - as at that time, it was permitted for us to build an earthen altar and sacrifice upon it. But [the Sages] have already said that the [actual] content in this is that He commanded us to to build an altar that is connected to the ground, and that it not be detached and moved, as it was in the desert [journey from Egypt]. And that is their saying in the Mekhilta DeRabbi Yishmael (Mekhilta DeRabbi Shimon bar Yochai 20:21) in explanation of this verse, "When you come to the land, make Me an altar that is attached to the ground." And since the matter is so, behold that this command is practiced for [all] generations; and it would be one of the parts of the Temple - meaning that specifically an altar of stones be built. And they said in the Mekhilta (Mekhilta d'Rabbi Yishmael 20:22:1) in explanation of, "And if an altar of stones you make for Me" (Exodus 20:22), "Rabbi Yishmael says, 'Each and every, if, in the Torah [connotes] optionality, except for three.'" And one of the them is, "And if an altar of stones." They said, "'And if an altar of stones you make for Me.' This is obligatory. You say it is obligatory, but perhaps it is optional. [Hence] we learn to say, 'Of whole stones shall you build [the altar of the Lord]' (Devarim 27:6)." And the regulations of this commandment as a whole - meaning to say, the building of the Temple and its description and the building of the altar - have been explained in the tractate associated with it, and that is Tractate Middot. And likewise is the form of the menorah, the table and the golden altar; and the location of their placement in the chamber explained in the Gemara, Menachot and Yoma. (See Parashat Terumah; Mishneh Torah, The Chosen Temple 1.)

To not erect a matsevah: To not erect a matsevah in any place. And about this is it stated (Deuteronomy 16:22), "And you shall not erect for yourself a matsevah that the Lord, your God, hates." And Rambam, may his memory be blessed, wrote (Mishneh Torah, Laws of Foreign Worship and Customs of the Nations 6:6) that the content of the matsevah that the Torah forbade is a tall structure of stones or of dirt; as it was the custom of the worshippers of idolatry to build [it] and to gather around it for their evil service. And therefore Scripture distanced us that we should not do like it - and even to worship God, Blessed be He, upon it - in order to distance and bring to forget all of the matter of idolatry from between our eyes and from our thoughts. [It is] like the reason that we wrote adjacently about the planting of a tree in the Temple, according to Rambam, may his memory be blessed. And the building of the [central] altar is not included in this prohibition; as it is stated explicitly about it (Deuteronomy 27:6), "Whole stones shall you build the altar, etc." Rather, [it is] that we not do so in other places.