أَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ، عَنْ خَالِدٍ، قَالَ حَدَّثَنَا سَعِيدٌ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " أَتِمُّوا الصَّفَّ الأَوَّلَ ثُمَّ الَّذِي يَلِيهِ وَإِنْ كَانَ نَقْصٌ فَلْيَكُنْ فِي الصَّفِّ الْمُؤَخَّرِ " .
It was narrated from Anas that the Messenger of Allah (PBUH) said: "Complete the first row, then the one behind it, and if any row is to be leftincomplete let it be the last row." Translation Not Available
Book Ref: Sunan An Nisai Book 10 Hadith 818
Web Ref: Sunan An Nisai Vol 1 Book 10 Hadith 819