Father Abraham - a well-founded, but unavailing, claim of natural descent (Luk 3:8; Joh 8:37).
mercy on me - who never showed any (Jam 2:3).
send Lazarus - the pining victim of his merciless neglect.
that he may - take me hence? No; that he dares not to ask.
dip ... tongue - that is the least conceivable and the most momentary abatement of his torment; that is all. But even this he is told is (1) unreasonable.