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
suyuti:5101a –
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السيوطي:٥١٠١a –

"إِن الله وملائكته يُصَلُّونَ على الصَّفِّ الأَولِ. سوُّوا صُفُوفَكُم، وحاذُوا بَين مناكِبِكُمْ ولِينُوا في أيدى إِخْوانِكم، وسُدُّوا الْخَلَلَ؛ فإِن الشيطان يدخُلُ فيما بينكم مثل الْحذَفِ ".  

[حم] أحمد [طب] الطبرانى في الكبير عن أَبي أُمامة

See similar narrations below:

Collected by Ṭabarānī
tabarani:7727 – al-Ḥasan b. ʿAlī al-Maʿmarī > Aḥmad b. Ibrāhīm al-Mawṣilī > Faraj b. Faḍālah > Luqmān b. ʿĀmir > Abū Umāmah > Rasūl Allāh Ṣallá

[Machine] The Messenger of Allah ﷺ said, "Indeed, Allah and His angels send blessings upon the first row. So straighten your rows and align your shoulders, and make it easy for your brothers, and fill in the gaps, for indeed, the Shaytan enters through them like small lambs."  

الطبراني:٧٧٢٧ – حَدَّثَنَا الْحَسَنُ بْنُ عَلِيٍّ الْمَعْمَرِيُّ ثنا أَحْمَدُ بْنُ إِبْرَاهِيمَ الْمَوْصِلِيُّ ثنا فَرَجُ بْنُ فَضَالَةَ عَنْ لُقْمَانَ بْنِ عَامِرٍ عَنْ أَبِي أُمَامَةَ ؓ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «إِنَّ اللهَ وَمَلَائِكَتَهُ يُصَلُّونَ عَلَى الصَّفِّ الْأَوَّلِ سَوُّوا صُفُوفَكُمْ وَسَوُّوا بَيْنَ مَنَاكِبِكُمْ وَلِينُوا لِأَيْدِي إِخْوَانِكُمْ وَسَدِّدُوا الْخَلَلَ فَإِنَّ الشَّيْطَانَ يَدْخُلُ بَيْنَكُمْ مِثْلَ الْحَذَفِ» وَالْحَذَفُ وَلَدُ الضَّأْنِ الصِّغَارِ