Reference for Bava Kamma 52:6
הכיר בה ושכחה ועמד ונפלה לענין נזקין חייב לענין ד' דברים פטור לענין גלות חייב דאמר קרא (במדבר לה, יא) בשגגה מכלל דהוה ליה ידיעה והא הויא ליה ידיעה לענין שבת פטור לענין עבד פלוגתא דרשב"ג ורבנן
implying the existence of some [previous] knowledge [as to the dangerous weapon] and in the case before us such knowledge did at a time exist: concerning Sabbath,<span class="x" onmousemove="('comment',' I.e., if while unaware of the stone in his bosom he carried it with him into the open public thoroughfare, thus violating the Sabbath; cf. Shab. 96b. ');"><sup>19</sup></span> however, there is still exemption; regarding [the release of] a slave the difference of opinion between R. Simeon b. Gamaliel and the Rabbis<span class="x" onmousemove="('comment',' Supra p. 137. ');"><sup>20</sup></span> still applies. Where he intended to throw the stone to a distance of two cubits, but it fell at a distance of four,<span class="x" onmousemove="('comment',' For the minimum of distance to constitute the violation of Sabbath by throwing an object in a public thoroughfare is four cubits; v. Shab. 96b. ');"><sup>21</sup></span>