The Shulchan Aruch (493:2) writes that one should not cut one's hair until the morning of the 34th day of the 'Omer ("אין להסתפר עד יום ל"ד בבקר"). What is the source for waiting until the morning of ...
This year (2011) Lag Ba'omer falls out on a Sunday. I've heard from a few people that the halacha is that you can shave (and take a haircut) on the Friday beforehand l'kavod Shabbos. Are there any ...