Sahih al-Bukhari, 1123

Rapporté par Aïcha : Le Messager d’Allah (ﷺ) priait onze rak‘a, c’était sa prière. Il prolongeait la prosternation au point qu’on pouvait réciter cinquante versets du Coran avant qu’il ne relève la tête. Il priait deux rak‘a (Sunna) avant la prière du Fajr, puis il s’allongeait sur son côté droit jusqu’à ce que le muezzin vienne l’informer de la prière

Narrated `Aisha:Allah's Messenger (ﷺ) used to offer eleven rak`at and that was his prayer. He used to prolong the prostration to such an extent that one could recite fifty verses (of the Qur'an) before he would lift his head. He used to pray two rak`at (Sunna) before the Fajr prayer and then used to lie down on his right side till the call-maker came and informed him about the prayer