that while he was in the company of ʿUmar, ʿAmmar said to ʿUmar, "We were in a detachment and became Junub and I blew the dust off my hands (performed the rolling over the earth and prayed.)"
وَقَالَ لَهُ عَمَّارٌ كُنَّا فِي سَرِيَّةٍ فَأَجْنَبْنَا وَقَالَ تَفَلَ فِيهِمَا