7_Tamid 27b (bottom)

• Proof that the tunnels under the Bais Hamikdash would not 'holy/niskadesh'
• Reason Rav Safra allowed Rav Abba to enter the bathroom while he was in there (nervous that would cause sakanah by not going to the bathroom)
• Etiquette when giving someone your cup to drink (rinse first)
• Halacha that one must reveal the least when going to the bathroom