Reference for Pesachim 128:5

נכנסה כת ראשונה וכו': איתמר אביי אמר ננעלו תנן רבא אמר נועלין תנן

Hence fifty [in all] too are sufficient, thirty entering and preparing [their sacrifices], then ten e and ten leave, [and another] ten enter and [another] ten leave. THE FIRST DIVISION ENTERED etc. It was stated, Abaye said: We learned, 'They [the doors] locked themselves';<span class="x" onmousemove="('comment',' Or, were locked-miraculously, without human agency.');">⁵</span>

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