الوتر
كلمة (الوِتر) في اللغة صفة مشبهة باسم الفاعل، ومعناها الفرد،...
Anas (may Allah be pleased with him) reported: It is part of the Sunnah that when the Muezzin says in the Adhān for the Fajr prayer: "Come to success," he then says: "prayer is better than sleep."
شرح الحديث :
This Hadīth points out that the Adhān of Fajr prayer includes a particular phrase that is not said in the Adhān of other prayers; namely: “prayer is better than sleep.” The Muezzin should say it after the phrase: “Come to success.”