Sahih Bukhari Volume 1, Book 12, Hadith Number 821

Narated By ‘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.