Reference for Shabbat 5:4

מ"מ תרתי סרי הויין פטורי דאתי בהו לידי חיוב חטאת קא חשיב דלא אתי בהו לידי חיוב חטאת לא קא חשיב

'BOTH ARE EXEMPT?' But between them a [complete] action is performed! — It was taught: [And if anyone] of the common people sin unwittingly, in doing [any of the things etc.]:<span class="x" onmousemove="('comment',' Lev. IV, 27. ');">⁶</span> only he who performs the whole of it [a forbidden action], but not he who performs a portion thereof. [Hence] if a single person performs it, he is liable; if two perform it, they are exempt. It was stated likewise: R. Hiyya b. Gamada said: It emanated<span class="x" onmousemove="('comment',' Lit., 'it was cast forth'. ');">⁷</span>

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