Reference for Bava Kamma 77:6

שור האצטדין אינו חייב מיתה שנאמר (שמות כא, כח) כי יגח ולא שיגיחוהו:

THE OWNER IS LIABLE. WHERE, HOWEVER, AN OX OF A DEAF-MUTE, AN IDIOT OR A MINOR HAS GORED AN OX OF AN OWNER WHOSE FACULTIES ARE UNIMPAIRED, THERE IS NO LIABILITY.<span class="x" onmousemove="('comment',' In the case of Tam: v. the discussion in Gemara. ');">⁶</span>

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