A.T. Robertson Commentary Mark 1:40

"And there cometh to him a leper, beseeching him, and kneeling down to him, and saying unto him, If thou wilt, thou canst make me clean." — Mark 1:40 (ASV)

Kneeling down to him (κα γονυπετων). Picturesque detail omitted by some MSS. Luke 5:12 has "fell on his face."