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
quran:89:22 –

And your Lord has come and the angels, rank upon rank,  

and your Lord, that is to say, His command, and the angels arrive rank on rank (saffan saffan is a circumstantial qualifier, meaning ‘standing in rows’ or ‘made up of many ranks’),
القرآن:٨٩:٢٢ –

وَجَاءَ رَبُّكَ وَالْمَلَكُ صَفًّا صَفًّا  

{وجاء ربك} أي أمره {والملك} أي الملائكة {صفا صفا} حال، أي مصطفين أو ذوي صفوف كثيرة.