Shabbat 133a and Shabbat 133b, where in the discussion of circumcision and tzara’at, Abbaye learned the idea of R. Shim’on agreeing about pesik reisha, an inevitable secondary aspect of an act counts as intended. Also, the idea of tzitzin ha-me’akvin et ha-milah, the parts of the foreskin that must be removed to count as a valid circumcision, and the meaning of zeh E-li ve-Anvehu, this is my Gd and I will glorify Him, in the context of mitzvah performance.
