It is obligatory to recite Surah Al-Fatiha and the chapter after it in the two rak'ahs of the Fajr, Maghrib and Isha Prayers loudly. It is also obligatory to recite Al-Fatiha and the chapter after it of the first two rak'ahs of the Dhuhr and Asr prayers in a low whispering voice, while reciting the Bismillah loudly. The recitation in the third and fourth rak'ahs of all the prayers must be in a low whispering voice. The said laws are to be observed by men. For women, reciting loudly is not obligatory.