سورة الصافات

Ali ibn Ibrahim (may Allah have mercy on him): وَالصَّافَّاتِ صَفًّا [By those who draw themselves out in ranks] — they are the angels and the prophets (peace be upon them) and those who stand in ranks to worship Allah.

Ibn Abbas: The meaning is the angels who arrange themselves in ranks in the sky, like the ranks of the believers for prayer.