Ten - lepers - Concerning the leprosy see the note on Mat 8:2; and on Lev 13:1, etc. and Lev 14:1, etc.
Which stood afar off - They kept at a distance, because forbidden by law and custom to come near to those who were sound, for fear of infecting them. See Lev 13:46; Num 5:2; 2Ki 15:5.