Reference for Pesachim 115:5

אלא אמר רבא מצותו דתמיד משינטו צללי ערב מאי טעמא דאמר קרא בין הערבי' מעידנא דמתחיל שמשא למערב

Rather, said Raba: The duty of the tamid<span class="x" onmousemove="('comment',' The slaughtering of it.');">¹⁰</span> properly [begins] from when the evening shadows begin to fall.<span class="x" onmousemove="('comment',' Lit., 'decline'. The sun reaches its zenith at midday and then begins to decline in the west, the decline being perceptible from half an hour after midday, and this is regarded as the falling of the evening shadows.');">¹¹</span> What is the reason?

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