BT Yev 64b(22) :שתין סאבי הוינא וכולהו איעקור מפירקי׳ דרב הונא לבר אנא‏ : we were sixty old men, and all of us [lit. them] became sterile (from extended sitting) at PN's public lecture except for me
See the entire entry for preq, perqā n.m. segment, separation