Sahih Bukhari
Characteristics of Prayer
Volume: 001 / Book Number: 012 / Hadith Number: 821
Narrated 'Aisha:
Once Allah's Apostle delayed the 'Isha' prayer till 'Umar informed him that the women and children had slept. Then Allah's Apostle came out and said: "None from amongst the dwellers of earth have prayed this prayer except you." In those days none but the people of Medina prayed.