Ahaz, afraid of Rezin and Pekah, is comforted by Isaiah Isa_7:1-9; refusing to choose a sign, Christ is promised for one, Isa_7:10-16: his judgment should come by Assyria, Isa_7:17-25.
In the days of Ahaz, a most wicked king; yet no prophecies are more comfortable than those which were delivered in his time; God so ordering it, partly for the encouragement of the faithful that lived under his tyrannical and impious reign; and partly to manifest the riches and freeness of his grace, in conferring such favours upon a most worthless generation.
To war against it; which they attempted before in Jotham’s reign, 2Ki_15:37, but now more seriously undertook, though without success, as is noted here, and 2Ki_16:5.