More Discussions for this daf
1. The Obligation Of Berachah Rishonah 2. Basis for berachos 3. Neta Revai
4. Chutz Min ha'Yayin 5. A Sevara for Berachos 6. First Tosfos DH Keitzad
7. wine and olive oil 8. Kal VaChomer - Min HaTorah or Not? 9. "Em" - Mother is Klal Yisrael
10. Is logic as strong as a Biblical edict? 11. Rebbi Yehudah's opinion, and ha'Gagen/ha'Gefen 12. Kavanah For Tefilah
13. Tosfos DH Keitzad 14. Derech Eretz 15. The ideal in Torah learning
16. Fasting for a bad dream 17. The source for reciting Berachos 18. Special blessings for wine and bread
19. harmful effects of olive oil 20. The blessing for olive oil 21. Shirah of the Levi'im
22. ברכת על הגפן
DAF DISCUSSIONS - BERACHOS 35

Michael Jedwab asked:

The Gemara search in the hava-amina a posuk for limud of the first and last

brachot mideoraita. Ve lefi col haman deomrin bracha shelefanav nilmedet

bekalvahomer miberacha aharona. Lich'oura yotze shebehava amina hakalvahomer melamed al din deoraita shel beracha rishona. Im ken, gam leachar hamaskana shesh'ar haperot o "lav bar netia" haberacha aharona shelahem yotzet lanu misvara, harey she din birkat hamazon nish'ar deoraita veim ken gam haberacha harishona tih'ye deoraita mikal vahomer. Ve kashe de'harey yadua she kol berachot rishonot hinam derabanan.

The Kollel replies:

TOSFOS (DH l'Fanav Lo Kol sh'Ken) asks your question. The Hava Amina is that it was a full-fledged Kal v'Chomer. The Maskana is that it is not a real Kal v'Chomer because there is a Pircha to it, as the Gemara says earlier on 21a. (Ritva, Rashba)