Reference for Menachot 55:1

הא דקאי מזרח ומערב ואדי הא דקאי צפון ודרום ואדי

for in the one case [the priest] stood facing the west with his back to the east<span class="x" onmousemove="('comment',' This was the right and proper position for sprinkling the blood of the Red Cow, and it is valid even though the sprinklings were not quite in the direction of the Holy of Holies.');">¹</span> and sprinkled, whereas in the other he stood facing the south with his back to the north<span class="x" onmousemove="('comment',' In which case both the position of the priest who sprinkled the blood and the direction in which it was sprinkled were wrong, and therefore it is invalid.');">²</span>

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