Sahih Muslim Book 4, Hadith Number 736.
Chapter : Lying with one in menstruation above the waist wrapper.
Anas reported: Bilal was commanded (by the Apostle of Allah) to repeat (the phrases of) Adhan twice and once in Iqama. The narrator said: I made a mention of it before Ayyub who said: Except for saying: Qamat-is-Salat [the time for prayer has come].