ʿAmmar said to ʿUmar "I rolled myself in the dust and came to the Prophet ﷺ who said, 'Passing dusted hands over the face and the backs of the hands is sufficient for you.' "
عَمَّارٌ لِعُمَرَ تَمَعَّكْتُ فَأَتَيْتُ النَّبِيَّ ﷺ فَقَالَ يَكْفِيكَ الْوَجْهُ وَالْكَفَّانِ