Exodus 29:37

והיה המזבח קדש AND THE ALTAR SHALL BE [MOST] HOLY — and in what consists its holiness? In this: כל הנגע במזבח יקדש that WHATSOEVER TOUCHETH THE ALTAR SHALL BECOME HOLY — that even a sacrifice which is really invalid that has been brought upon it — even that does the altar sanctify making it a valid sacrifice in so far that it must not be taken down from the altar. Now since it is said, “Anything that toucheth the altar shall become holy”, I might infer that this applies to a thing whether it was fitting to be an offering at the time when it was brought into the Sanctuary or whether it was not so fitting as, for example, in the latter case, something the disqualification of which did not happen within the Sanctuary itself but had happened before it was brought there, such as, an animal, male or female, with which sexual sin had been committed, or an animal which had been set aside as a sacrifice to an idol, or one which had been worshipped as a god, or one which showed signs of incapacity to live owing to certain diseases (technically termed טרפה) and animals similar to these (with similar disqualifications); consequently it states, “Now this is that which thou shalt offer [upon the altar]”, which follows immediately after this (in v. 38). Now how is it in the case of the burnt-offering which is mentioned in the next verse as something commanded to be brought upon the altar? It must be fitted to be brought upon the altar! So, also, the preceding statement, “Whatever [touches the altar shall become holy]”, refers only to whatever was fitting, i. e. what was already fitting to be brought upon the altar and became disqualified only after it had been brought into the fore-court of the Sanctuary, as, for example, that which had been left over night (the blood or fat of a sacrifice which had been left until the morning without having been placed upon the altar), or that which, before it had been placed upon the altar, had been taken (lit., had gone forth) outside the forecourt, or that which had become unclean, or an animal which had been slaughtered with the intention to sprinkle the blood or to burn the fat or to eat the flesh outside the prescribed period or outside the prescribed place, and animals similar to these (Zevachim 83b).

שִׁבְעַ֣ת יָמִ֗ים תְּכַפֵּר֙ עַל־הַמִּזְבֵּ֔חַ וְקִדַּשְׁתָּ֖ אֹת֑וֹ וְהָיָ֤ה הַמִּזְבֵּ֙חַ֙ קֹ֣דֶשׁ קׇֽדָשִׁ֔ים כׇּל־הַנֹּגֵ֥עַ בַּמִּזְבֵּ֖חַ יִקְדָּֽשׁ׃ {ס}        

Seven days thou shalt make an atonement for the altar, and sanctify it; and it shall be an altar most holy: whatever touches the altar shall be holy.