Middos 3:2 - 3:3

ובקרן מערבית דרומית – a cubit below the foundation, there were two perforations.

שהדמים הניתמים על יסוד מערבי – as, for examples the remnants of the blood of the inner sin-offerings, which are afrer all of he gifts, he would pour the remnants of the blood on the western foundation.

ועל יסוד דרומי – the remnants of the blood of the outer [sacrifices (see Tractate Zevakhim, Chapter 5, Mishnayot 1-3).

יורדין – on the path of those perforations and mix in the water channel that is in the Temple court, an from there leave to the Kidron Valley. And the owners of gardens would purchase them from the treasures to manure the land (see Tractate Yoma, Chapter 5, Mishnah 6 and Tractate Taanit, Chaptet 4, Mishnah 1).

באותו הקרן – of the southwestern [corner].

שבו יורדין לשית – to a cavity that is underneath the altar corresponding to the place of the libations (see Tractate Meilah, Chapter 3, Mishnah 3).

וכבש היה לדרומו של מזבח – a kind of slanting bridge and it is made sloping for on it they ascend and descend from the altar. For it was not possible to ascend to it on the steps because it states (Exodus 20:23): “Do not ascend My altar by steps, [that your nakedness may not be exposed upon it].”

שלשים ושתים – its length was given from south to north, and its width from east to west, sixteen cubits.

ורבובה (a cavity in the ascent to the altar for deposit of ritually disqualified fowls) – it is a kind of hollow window. It was one cubit by one cubit. And it stood on the ramp to its western side.

רבובה – like hallow/נבוב , in the language of נבוב לחות (Job 11:12): “A hollow man will get understanding, [When a wild ass is born a man].”

נותנין פסולי חטאת העוף – that they will be there until they are brought to [become] left-overs (after the time permitted for it to be eaten; if one consumes it, one is punishable by extirpation. The Sages rendered these leftovers as ritually impure, so that the priests would be meticulous in their removal), and afterwards, they would go out to the House of the Burning.