Reference for Sanhedrin 144:16

ההיא רבי יוסי ברבי יהודה היא דתניא רבי יוסי בר' יהודה אומר חבר אין צריך התראה לפי שלא ניתנה התראה אלא להבחין בין שוגג למזיד

Another [Baraitha] taught: if a thief be found breaking in: from this I know the law only for breaking in: whence do I know it if he be found on the roof, in the court, or an enclosure? From the verse, 'If the thief be found,' implying. Wherever he is found as thief. If so, why state 'breaking in'? — Because his breaking in constitutes a formal warning.<span class="x" onmousemove="('comment',' I.e., the owner need not warn him before killing him, as in the case elsewhere. ');">¹⁴</span>

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