Hafsa bint 'Abdur-Rahman ibn Abi Bakr حفصة بنت عبد الرحمن بن أبي بكر الصديق · Call to Prayers (Adhaan)

When the Mu'adh-dhin pronounced the Adhan for Fajr prayer and the dawn became evident the Prophet ordered a two rak`at light prayer (Sunna) before the Iqama of the compulsory (congregational) prayer.