Reference for Zevachim 115:11

לא צריכא דבצריה בצורי

The [above] text [stated]: R'Assi said in R'Johanan's name: R'Jose son of R'Judah admits that if he slaughtered them in a corresponding position on the ground, they are unfit.' R'Aha of Difti asked Rabina: What does 'in a corresponding position on the ground' mean?<span class="x" onmousemove="('comment',' It cannot mean on the pavement at the side of the altar, for then there would be no difficulty on R. Assi's view. For even if the whole altar stood in the north, yet if one slaughtered on the west or east of it at some distance from the actual side, it would still be unfit, because it must be killed between the north side of the altar and the opposite wall of the Temple court; therefore this could not prove that R. Jose did not hold that half the altar was in the north and half in the south. Hence it must apparently mean, on the ground of the altar itself. Now, how is this possible?');">¹³</span>

Jastrow