“Even if you're in the Beis Medrash, there's no chalois of seder until 9:00 A.M.” (Weiser)

“This k'nas is a chal of Rebbe's new strict policy on attendance in shiur.” (Weiser)

"We are all mitztaref on the daled amos where a chalois of that machloikes happened in order to be mechabed the soldiers who dinged zich with each other." (source)