Reference for Pesachim 115:9

ת"ר כסידורו בחול כך סידורו בשבת דברי ר' ישמעאל רבי עקיבא אומר כסידורו בערב פסח

Our Rabbis taught: Just as its order during the week, so is its order on the Sabbath: these are the words of R'Ishmael. R'Akiba said: Just as its order on the eve of Passover. What does this mean? - Said Abaye, This is what it means: Just as its order on a weekday which is the eve of Passover, so is its order on the Sabbath which is the eve of Passover:<span class="x" onmousemove="('comment',' I.e., in both cases the tamid is slaughtered at seven and a half hours.');">¹⁸</span>

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