Reference for Bava Kamma 133:4

קבעו ולבסוף חקקו אינו פוסל את המקוה

that a trough<span class="x" onmousemove="('comment',' Through which rain or well water was conducted to a mikweh which should be a gathering of well or rain water that has not passed through a receptacle. ');">⁷</span> which was first hollowed out and subsequently fixed [into a mikweh]<span class="x" onmousemove="('comment',' Lit., 'a gathering of water' for ritual immersion; cf. Glos. ');">⁸</span>

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