Why didn't King Ahaz ask God for a sign in Isaiah 7 v12?

Answer 1

There were 4 reasons:-

(1) He was secretly relying on the aid of Assyria.

(2) If the miracle had been "really performed," it would have been a proof that Yahweh was the true God a proof which Ahaz had no desire of witnessing. He was a gross idolater; and he was not anxious to witness a demonstration which would have convinced him of the folly and sin of his own course of life.

(3) If the miracle could not be performed then it would have unsettled the confidence of and totally disheartened the people.

(4)According to the prevailing notions at that period, every nation had its own gods. Those of one people were more, and those of another less powerful. If a miracle had been performed, Ahaz might have believed that it was performed by the god of that country, who might have had the disposition, but not the power, to defend him. It would have been to the mind of the idolater no proof that the god of Syria or Samaria was not more powerful, and might not have easily overcome him. Ahaz seems to have regarded Yahweh as such a God - as one of the numerous gods which were to be worshipped. This was certainly the view of the surrounding idolaters .

Keil & Delitzsch in their "Commentary on the Old Testament" say that:-

Isa 7:10-12 -

...Nevertheless the grace of God did not give up the unhappy son of David for lost. "And Jehovah continued speaking to Ahaz as follows: Ask thee a sign of Jehovah thy God, going deep down into Hades, or high up to the height above." ...Ahaz was to ask for a sign from Jehovah his God. ... The thing to be confirmed on the present occasion was what the prophet had just predicted in so definite a manner, viz., the maintenance of Judah with its monarchy, and the failure of the wicked enterprise of the two allied kingdoms. If this was to be attested to Ahaz in such a way as to demolish his unbelief, it could only be effected by a miraculous sign. And just as Hezekiah asked for a sign when Isaiah foretold his recovery, and promised him the prolongation of his life for fifteen years, and the prophet gave him the sign he asked, by causing the shadow upon the royal sun-dial to go backwards instead of forwards (chapter 38); so here Isaiah meets Ahaz with the offer of such a supernatural sign, and offers him the choice of heaven, earth, and Hades as the scene of the miracle.

... But Ahaz had no doubt about his miraculous power, though he would not be constrained by any miracle to renounce his own plans and believe in Jehovah. "But Ahaz replied, I dare not ask, and dare not tempt Jehovah." What a pious sound this has! And yet his self-hardening reached its culminating point in these well-sounding words. He hid himself hypocritically under the mask of Deu_6:16, to avoid being disturbed in his Assyrian policy, and was infatuated enough to designate the acceptance of what Jehovah Himself had offered as tempting God. He studiously brought down upon himself the fate denounced in Isa_6:1-13, and indeed not upon himself only, but upon all Judah as well. For after a few years the forces of Asshur would stand upon the same fuller's field (Isa_36:2) and demand the surrender of Jerusalem. In that very hour, in which Isaiah was standing before Ahaz, the fate of Jerusalem was decided for more than two thousand years. Albert Barnes in his "Notes on The Bible" says:-

Isa 7:12 -

I will not ask - In this case Ahaz assumed the appearance of piety, or respect for the command of God. In Deu_6:16, it is written, 'Thou shalt not tempt the Lord thy God;' and Ahaz perhaps had this command in his eye. It was a professed reverence for God. But the true reason why he did not seek this sign was, that he had already entered into a negotiation with the king of Assyria to come and defend him; and that he was even stripping the temple of God of its silver and gold, to secure this assistance; 2Ki_16:7-8. When people are depending on their own devices and resources, they are unwilling to seek aid from God; and it is not uncommon if they excuse their want of trust in him by some appearance of respect for religion.

Tempt - Try, or do a thing that shall provoke his displeasure, or seek his interposition in a case where he has not promised it. To tempt God is the same as to put him to the proof; to see whether he is able to perform what he proposed. It is evident, however, that here there would have been no "temptation" of God, since a sign had been offered him by the prophet in the name of God. 'The answer of Ahaz can be regarded either as one of bitter scorn,...as the language of a hypocrite who assumes the mask of reverence for God and his command.' ...If it be asked here "why" Ahaz did not put Isaiah to the test, and "secure," if possible, the divine confirmation to the assurance that Jerusalem would be safe, the following may be regarded as the probable reasons:

(1) He was secretly relying on the aid of Assyria. He believed that he could fortify the city, and distress the enemy by turning away the supply of water, so that they could not carry on a siege, and that all the further aid which he needed could be derived from the Assyrians.

(2) If the miracle had been "really performed," it would have been a proof that Yahweh was the true God a proof which Ahaz had no desire of witnessing. He was a gross idolater; and he was not anxious to witness a demonstration which would have convinced him of the folly and sin of his own course of life.

(3) If the miracle could not be performed, as Ahaz seems to have supposed would be the case, then it would have done much to unsettle the confidence of the people, and to have produced agitation and alarm. It is probable that a considerable portion of the people were worshippers of Yahweh, and were looking to him for aid. The pious, and the great mass of those who conformed to the religion of their fathers, would have been totally disheartened; and this was a result which Ahaz had no desire to produce.

(4) Michaelis has suggested another reason, drawn from the character of idolatry. According to the prevailing notions at that period, every nation had its own gods. Those of one people were more, and those of another less powerful; see Isa_10:10-11; Isa_36:18-20; Isa_37:10-13. If a miracle had been performed, Ahaz might have believed that it was performed by the god of the country, who might have had the disposition, but not the power, to defend him. It would have been to the mind of the idolater no proof that the god of Syria or Samaria was not more powerful, and might not have easily overcome him. Ahaz seems to have regarded Yahweh as such a God - as one of the numerous gods which were to be worshipped, and perhaps as not the most powerful of the tutelary divinities of the nations. This was certainly the view of the surrounding idolaters Isa_10:10-11; Isa_36:18-20; and it is highly probable that this view prevailed among the idolatrous Israelites.

Answer 2

King Ahaz did not ask for a sign from God because he was already planning to seek help from the Assyrian Empire instead of trusting in God. He was more interested in political alliances rather than relying on divine guidance.