Zevachim 58B

רבי יוסי אומר: זה סימן ⁠– כל הניטל בפנים לינתן בחוץ, אינו נותן אלא בסמוך שאין לפנים;

R' Yosei says: This is the principle of where sacrificial items are placed on the inner and outer altars: Any sacrificial item that is taken from the altar located inside the Sanctuary in order to be placed on the altar outside the Sanctuary, in the Temple courtyard, may be placed only on the area of that altar that is near the Sanctuary, so that there is no area closer to the inside of the Sanctuary. It must therefore be placed on the part of the external altar closest to the entrance to the Sanctuary.

וכל הניטל בחוץ לינתן לפנים, אינו ניטל אלא בסמוך שאין לפנים.

And any sacrificial item that is taken from the altar outside the Sanctuary, in the Temple courtyard, in order to be placed on the altar located inside the Sanctuary, may be taken only from the area of the external altar that is near the Sanctuary, so that there is no area closer to the inside of the Sanctuary, i.e., from the part of the external altar closest to the entrance to the Sanctuary.

כל הניטל בפנים לינתן בחוץ ⁠– מאי ניהו? אילימא שירים, בהדיא כתיב בהו: ״אל יסוד מזבח העולה אשר פתח אהל מועד״!

The Talmud clarifies: With regard to the statement concerning any sacrificial item that is taken from the altar located inside the Sanctuary in order to be placed on the altar outside the Sanctuary, what are these items? If we say they are the remaining blood of the sin offerings whose blood is presented on the inner altar, there is no reason for R' Yosei to formulate his principle, as it is explicitly written concerning them: “And all the remaining blood of the bull he should pour out at the base of the altar of the burnt offering, which is at the entrance to the Tent of Meeting” (Leviticus 4:7). This verse describes how the blood of the inner sin offerings that remained after the sprinkling was to be poured out on the base of the west side of the altar, which is the side closest to the entrance to the Sanctuary.