Gemara:

Shabbat 

Collections: Rabbi Tendler Shabbos 2010

References: Shabbat: 75a ,  Shabbat: 134b ,  Shulchan Aruch: Hilchos Shabbos Siman 331  

Description

The Gemara learns about the melacha of trapping animals. The Chilazon was snail was trapped to remove its glands, whose dye was used for Techeiles. Rav Tendler talks about the halachos of preparing for a bris milah on Shabbos. The controversy of Metzitza ba Peh is discussed.