Mishkat al-Masabih #1032
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَتِمُّوا الصَّفَّ الْمُقَدَّمَ ثُمَّ الَّذِي يَلِيهِ فَمَا كَانَ مِنْ نَقْصٍ فَلْيَكُنْ فِي الصَّفّ الْمُؤخر» . رَوَاهُ أَبُو دَاوُد
He reported God’s Messenger as saying, "Complete the front row, then the one that comes next, and if there is any incompleteness let it be in the last row.”
Abu Dawud transmitted it.
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About Mishkat al-Masabih
This hadith is #1032 from Mishkat al-Masabih, in the Book of Prayer.