BT Ber 13b(50) :השתא מישאל שאיל אהדורי מיבעיא‏ : now that we know that he certainly may greet, is responding necessary?
See the entire entry for ha$tā adv. now

BT Ber 13b(50) :מישאל שאיל‏ :
See the entire entry for šˀl vb. to ask