669 - وَ رَوَى أَبُو عَبْدِ اَللَّهِ اَلْفَرَّاءُ عَنِ اَلصَّادِقِ عَلَيْهِ اَلسَّلاَمُ: أَنَّهُ قَالَ لَهُ رَجُلٌ مِنْ أَصْحَابِنَا إِنَّهُ رُبَّمَا اِشْتَبَهَ عَلَيْنَا اَلْوَقْتُ فِي يَوْمِ غَيْمٍ فَقَالَ «تَعْرِفُ هَذِهِ اَلطُّيُورَ اَلَّتِي تَكُونُ عِنْدَكُمْ بِالْعِرَاقِ يُقَالُ لَهَا اَلدُّيُوكُ» فَقَالَ نَعَمْ قَالَ «إِذَا اِرْتَفَعَتْ أَصْوَاتُهَا وَ تَجَاوَبَتْ فَعِنْدَ ذَلِكَ فَصَلِّ.
Hadith.669 - Imam Jafar ibn Muhammad Al-Sadiq 
Al-Farra' that a man from among their companions said to him: "Sometimes the time of prayer becomes unclear for us on a cloudy day."
The Imam said: "Do you know these birds that you have in Iraq, which are called roosters (duyook)?"
The man replied: "Yes."
The Imam said: "When their voices rise and they begin to respond to each other, then at that time, pray."
