Charles Ellicott Commentary Mark 10:51

"And Jesus answered him, and said, What wilt thou that I should do unto thee? And the blind man said unto him, Rabboni, that I may receive my sight." — Mark 10:51 (ASV)

Lord.—Better Rabboni, the word being the same as in John 20:16, and occurring in these two passages only. The word was an augmentative form of Rabbi, and as such expressed greater reverence. It takes its place as another example of St. Mark’s fondness for reproducing the very syllables that were spoken.