Hadith 1074
Mishkat al-Masabih
Prayer · The Congregation and its Excellence - Section 3
Arabic
وَعَنْهُ قَالَ: أَمَرَنَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " إِذَا كُنْتُمْ فِي الْمَسْجِدِ فَنُودِيَ بِالصَّلَاةِ فَلَا يَخْرُجْ أَحَدُكُمْ حَتَّى يُصَلِّيَ. رَوَاهُ أَحْمد
English translation
He said that God’s Messenger gave them this command, “When you are in the mosque and the call to prayer is made, none of you must go out before he prays.” Ahmad transmitted it.