Job 2:12

knew him not He was so altered and disfigured by the disease. As Job perhaps lay outside the town they may have seen him at a distance.

sprinkled dust upon their heads that is, they threw dust upwards towards heaven, which fell upon their heads, the gesture intimating perhaps that they were laid in the dust by a calamity sent from heaven; comp. Jos 7:6; 1 Samuel 4:12; Lamentations 2:10. See on Job 1:20.