عَنْ أَبِي أُمَامَةَ رَضِيَ اللَّهُ عَنْهُ عَنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَنَّهُ قَالَ: ((لَتُسَوُّنَّ الصُّفُوفَ أَوْ لَتُطْمَسَنَّ وُجُوهُكُمْ وَلَتُغْمِضُنَّ أَبْصَارَكُمْ أَوْ لَتُخْطَفَنَّ أَبْصَارُكُمْ))
It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: You must certainly straighten your rows or else the forms of your faces will be changed, and you must certainly lower your eyes or else your eyes will surely be snatched away.