"Come forward and follow me, and let those who are behind you follow your lead. If people continue to lag behind, Allah, the Mighty and Sublime, will put them back."  

أَنَّ النَّبِيَّ ﷺ رَأَى فِي أَصْحَابِهِ تَأَخُّرًا فَقَالَ تَقَدَّمُوا فَأْتَمُّوا بِي وَلْيَأْتَمَّ بِكُمْ مَنْ بَعْدَكُمْ وَلاَ يَزَالُ قَوْمٌ يَتَأَخَّرُونَ حَتَّى يُؤَخِّرَهُمُ اللَّهُ ﷻ  

(Another chain) from Abu Nadrah (from Abu Sa'eed) with similar narration.  

عَنْ أَبِي نَضْرَةَ نَحْوَهُ  

"The Prophet was in front of Abu Bakr and he prayed sitting down, and Abu Bakr was leading the people in prayer, and the people were behind Abu Bakr."  

أَنَّ رَسُولَ اللَّهِ ﷺ أَمَرَ أَبَا بَكْرٍ أَنْ يُصَلِّيَ بِالنَّاسِ قَالَتْ وَكَانَ النَّبِيُّ ﷺ بَيْنَ يَدَىْ أَبِي بَكْرٍ فَصَلَّى قَاعِدًا وَأَبُو بَكْرٍ يُصَلِّي بِالنَّاسِ وَالنَّاسُ خَلْفَ أَبِي بَكْرٍ  

"The Messenger of Allah ﷺ led us in Zuhr prayer and Abu Bakr was behind him. When the Messenger of Allah ﷺ said the Takbir, Abu Bakr said the Takbir so that the people could hear."  

صَلَّى بِنَا رَسُولُ اللَّهِ ﷺ الظُّهْرَ وَأَبُو بَكْرٍ خَلْفَهُ فَإِذَا كَبَّرَ رَسُولُ اللَّهِ ﷺ كَبَّرَ أَبُو بَكْرٍ يُسْمِعُنَا