False Prophets will Arise. The Test of A True Prophet (Deuteronomy 18:20-22).
“ But the prophet, that shall speak a word presumptuously in my name, which I have not commanded him to speak, or that shall speak in the name of other gods, that same prophet shall die.”
But the danger was that false prophets would also arise. Let men beware of being false prophets. The position of the prophets was to be so important that anyone who feigned being a prophet was to be put to death. If men professed to be prophets but spoke their own words pretending that they were Yahweh's, speaking their own wisdom presumptuously pretending that it was God's, giving commands in His name which had not really come from Him, then they were to die. So also were any who came as prophets in the names of other gods.
‘ And if you say in your heart, “How shall we know the word which Yahweh has not spoken?” '
But this would immediately raise the question as to how they were to know whether this was so or not, how they were to know what God had not said and how they were to recognise God's truth.
‘ When a prophet speaks in the name of Yahweh, if the thing follow not, nor come about, that is the thing which Yahweh has not spoken. The prophet has spoken it presumptuously. You shall not be afraid of him.'
The solution was outwardly simple. If a man speaks in the name of Yahweh, and what he says ‘is not' and/or ‘does not come about', then that is the proof that Yahweh has not spoken through him, and that the prophet has spoken presumptuously. Thus they need not be afraid of his words.
The emphasis here is on the fact that Yahweh's words always have genuine content and that He always does what He says He will do. In view of the non-mention of a positive perspective this would seem to be as much a careful declaration that Yahweh would honour the word of His true prophets as the simple test of a prophet. But the outcome of some prophecies would not be apparent for some considerable time. The people still had to weigh up their words and consider the likelihood of their fulfilment in the light of the Scriptures that they had, and in the light of the covenant.
But the corollary is that if a man speaks in the name of Yahweh and what he says has powerful moral impact and does continually come about, then unless there are grounds for thinking otherwise it would be an indication that he did come from Yahweh. Thus he should be heeded, and his words treasured, especially if he urged them to the fear of Yahweh. And they should listen and fear what he says. A prophet who does not bring them to the fear of Yahweh should certainly, however, not be heeded. Nor should one whose words failed of fulfilment. And certainly one who came in the name of other gods should be rejected immediately.
It will be observed that this proof could not in many cases be fully known at the time of the prophecy, although it would in some be apparent shortly afterwards, for the message of the prophet was regularly concerning immediate and local situations. Thus its manifest truthfulness or otherwise would become apparent. Once the prophet's integrity was established he could then be trusted. There are many examples of such short term prophecies in Scripture, men who came, spoke truly, and went (Judges 6:8; 1 Samuel 22:5; 2Sa 24:11; 1 Kings 11:29; 1 Kings 13:1; and often). But although they disappeared from our point of view they would continue to be known in the community.
In the case of the prophets of whom we know most, because their words were recorded, much of their prophecy was looking into the future that was coming which would take time to unfold, but it is clear from their words that they expected their listeners to use their moral judgment, and recognise the truth of the situation. And that some did so comes out in that their words were preserved.
The very content of the prophecy often demonstrated its own truth. The true prophet's warnings were unheeded, not because they were manifestly untrue, but because men did not want to hear what they were saying, because their hearts were hardened. We all like men who tell us what we want to hear. Had their hearts been right, and had they thought more deeply, they would have known. A clear example can be found of this in 1 Kings 2:5-18).
Later tests given would be that they must be tested against God's own words received from the past (Isaiah 8:20). Another that they could be tested by the voice of God's Spirit within Who would witness to what was true (1 John 1:20, 27). But in the end the prophet was recognised by those whose hearts were right and true to the covenant.