They have Moses and the prophets. In the persons of the rich man and Abraham Christ reminds us, that we have received an undoubted rule of life, and that therefore we have no right to expect that the dead will rise to instruct and persuade us. Moses and the prophets were appointed to instruct, while they lived, the men of their own age; but it was with the design, that the same advantage should be derived by posterity from their writings. As it is the will of God that we should receive instructions, in this manner, about a holy life, there is no reason why the dead should assure us of the rewards and punishments of the future state; nor is there any excuse for the indifference of those who shelter themselves under the pretext, that they do not know what is going on beyond this world. Among irreligious men, we are aware, is frequently heard this wicked saying, or rather this grunting of hogs, that it is foolish in men to distress themselves with fears about a matter of uncertainty, since no one has ever returned to bring us tidings about hell. With the view of counteracting every enchantment of Satan of this description, Christ draws their attention to the Law and the Prophets, agreeably to that passage in the writings of Moses: It is not in heaven, that thou shouldest say, Who shall go up for us to heaven, and bring it unto us, that we may hear it, and do it? Neither is it beyond the sea, that thou shouldest say, Who shall go over the sea for us, and bring it unto us, that we may hear it, and do it? But the word is very nigh unto thee, even in thy mouth, and in thy heart, that thou shouldest do it, (Deuteronomy 30:12-14.) They who ridicule as fabulous what Scripture testifies as to the future judgment, will one day feel how shocking is the wickedness of giving the lie to the holy oracles of God. From such lethargy Christ arouses his followers, that they may not be deceived by the hope of escaping punishment, and thus fail to improve the time allowed for repentance. Abraham's reply amounts to this: By Moses and the prophets God had sufficiently made known to his people the doctrine of salvation, and nothing remains for us but that it obtain the assent of all. So thoroughly infected is the mind of man with a depraved curiosity, that the greater part of men are always gaping after new revelations. Now as nothing is more displeasing to God than when men are so eager to go beyond due bounds, he forbids them to inquire at magicians and soothsayers respecting the truth, and to consult pretended oracles after the manner of the Gentiles; and in order to restrain that itching curiosity, he promises, at the same time, that he will give prophets, from whom the people may learn whatever is necessary to be known for salvation, (Deuteronomy 18:9,15.) But if the prophets were sent for the express purpose; that God might keep his people under the guidance of his word, he who is not satisfied with this method of instruction is not actuated by a desire to learn, but tickled by ungodly wantonness; and therefore God complains that He is insulted, when He alone is not heard from the living to the dead, (Isaiah 8:19.) The division of the word of God, which Abraham makes, into the Law and the Prophets, refers to the time of the Old Testament. Now that the more ample explanation of the Gospel has been added, there is still less excuse for our wickedness, if our dislike of that doctrine hurries us in every possible direction, and, in a word, if we do not permit ourselves to be regulated by the word of God. Hence too we infer how solid is the faith of Papists about purgatory and such fooleries, when it rests on nothing but phantoms. [1]

Footnotes

1 - "Veu qu'elle n'est appuyee et fondee qu'en des apparitions et vaines imaginations d'aucuns cerveaux esventez;" -- "since it rests and is founded only on apparitions and vain imaginations of certain giddy brains."

They have Moses - The writings of Moses. The first five books of the Bible.
The prophets - The remainder of the Old Testament. What the prophets had written.
Hear them - Hear them speak in the Scriptures. Read them, or hear them read in the synagogues, and attend to what they have delivered.

They have Moses and the prophets - This plainly supposes they were all Jewish believers: they had these writings in their hands, but they did not permit them to influence their lives.

Abraham said unto him..... In reply to this his request:
they have Moses and the prophets; that is, their writings; which shows this man, and his five brethren, to be Jews; for to them were the oracles of God committed; and these had the writings of Moses and the prophets read to them every sabbath day; and is true, whether the contemporaries and immediate successors of the Pharisees are meant, or the ten tribes: and also shows, that one view of the parable, is to establish the authority of these writings; see Luke 16:16 and that it is a peculiar privilege to have them; and that they ought to be attended to and regarded;
let them hear them; for they testified concerning Christ, and concerning the sins of the Jews, and the calamities, both temporal and eternal, that should come upon them; and which, testimony was sufficient to leave them without excuse: and indeed, the word of God, read, explained, and heard, is the ordinary means of conversion, or of bringing men to faith and repentance.