In contrast to "talaq al-sunnah", "talaq al-bid'ah" does not observe the waiting period and irrevocably terminates the marriage. It may involve a "triple talaq", i.e., the declaration of talaq repeated three times, or a different formula such as "you are "haram" for me". Some legal schools held that a triple talaq performed in a single meeting constituted a "major" divorce, while others classified it as a "minor" divorce. "Talaq al-bid'ah" reflects pre-Islamic divorce customs rather than Quranic principles, and it is considered to be a particularly disapproved, though legally valid form of divorce in traditional Sunni jurisprudence. According to Islamic tradition, Muhammad denounced the practice of triple talaq, and the second caliph Umar punished husbands who made use of it.