كتاب الصلاة
Read the English translation first, with the original Arabic directly underneath.
Narrated AbuAyyub:
Marthad ibn Abdullah said: When AbuAyyub came upon us to fight the infidels and in those days Uqbah ibn Amir was the Governor of Egypt, he (Uqbah) delayed the sunset prayer. Hence AbuAyyub stood and said: What kind of prayer is this, Uqbah? He said: We were busy. He said: Did you not hear the Messenger of Allah (ﷺ) say: My community will remain well, or he said: will remain on its natural condition, so long as it would not delay the evening prayer until the stars shine brightly just like a network.
لاَ تَزَالُ أُمَّتِي بِخَيْرٍ - أَوْ قَالَ عَلَى الْفِطْرَةِ - مَا لَمْ يُؤَخِّرُوا الْمَغْرِبَ إِلَى أَنْ تَشْتَبِكَ النُّجُومُ