Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
abudawud:681 – Jaʿfar b. Musāfir > Ibn Abū Fudayk > Yaḥyá b. Bashīr b. Khalāad from his mother

The Prophet ﷺ said: Have the imam in the centre and close up the gaps.  

أبو داود:٦٨١ – حَدَّثَنَا جَعْفَرُ بْنُ مُسَافِرٍ حَدَّثَنَا ابْنُ أَبِي فُدَيْكٍ عَنْ يَحْيَى بْنِ بَشِيرِ بْنِ خَلاَّدٍ عَنْ أُمِّهِ أَنَّهَا دَخَلَتْ عَلَى مُحَمَّدِ بْنِ كَعْبٍ الْقُرَظِيِّ فَسَمِعَتْهُ يَقُولُ حَدَّثَنِي أَبُو هُرَيْرَةَ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ وَسِّطُوا الإِمَامَ وَسُدُّوا الْخَلَلَ  

See similar narrations below:

Collected by Bayhaqī, Suyūṭī
bayhaqi:5203 – Abū ʿAlī al-Rūdhbārī > Abū Bakr b. Dāsah > Abū Dāwud > Jaʿfar b. Musāfir > Ibn Abū Fudayk > Yaḥyá b. Bashīr b. Khallād from his mother

The Prophet ﷺ said: Have the imam in the centre and close up the gaps. (Using translation from Abū Dāʾūd 681)   

البيهقي:٥٢٠٣ – أَخْبَرَنَا أَبُو عَلِيٍّ الرُّوذْبَارِيُّ أنبأ أَبُو بَكْرِ بْنُ دَاسَةَ ثنا أَبُو دَاوُدَ ثنا جَعْفَرُ بْنُ مُسَافِرٍ ثنا ابْنُ أَبِي فُدَيْكٍ عَنْ يَحْيَى بْنِ بَشِيرِ بْنِ خَلَّادٍ عَنْ أُمِّهِ أَنَّهَا دَخَلَتْ عَلَى مُحَمَّدِ بْنِ كَعْبٍ الْقُرَظِيِّ فَسَمِعَتْهُ يَقُولُ حَدَّثَنِي أَبُو هُرَيْرَةَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ تَوَسَّطُوا الْإِمَامَ وَسُدُّوا الْخَلَلَ