وَعَنِ ابْنِ عُمَرَ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَأْمُرُنَا بِالتَّخْفِيفِ وَيَؤُمُّنَا ب (الصافات)
رَوَاهُ النَّسَائِيّ
God’s Messenger used to command us to be brief, and he would recite as-Saffat (Al-Qur’an; 37) when he was our imam.
Nasa’i transmitted it.