Isaiah 8:14
14. sanctuary—inviolable asylum, like the altar of the temple (1Ki 1:50; 2:28; Eze 11:16; compare Pr 18:10); namely, to those who fear and trust in Him.
but . . . offence—that is, a rock over which they should fall to their hurt; namely those who would not believe. both . . . houses—Israel and Judah. Here again the prophecy expands beyond the temporary application in Ahaz' time. The very stone, Immanuel, which would have been a sanctuary on belief, becomes a fatal stumbling-block through unbelief. Jesus Christ refers to this in Mt 21:44. (Compare De 32:4, 15, 18, 30, 31, 37; Da 2:34; Ro 9:33; 1Pe 2:8). gin—trap, in which birds are unexpectedly caught (Lu 21:35; 1Th 5:2). So at the destruction of Jerusalem under Titus. Matthew 21:44
44. And whosoever shall fall on this stone shall be broken: but on whomsoever it shall fall, it will grind him to powder—The Kingdom of God is here a Temple, in the erection of which a certain stone, rejected as unsuitable by the spiritual builders, is, by the great Lord of the House, made the keystone of the whole. On that Stone the builders were now "falling" and being "broken" (Isa 8:15). They were sustaining great spiritual hurt; but soon that Stone should "fall upon them" and "grind them to powder" (Da 2:34, 35; Zec 12:2) —in their corporate capacity, in the tremendous destruction of Jerusalem, but personally, as unbelievers, in a more awful sense still.
1 Peter 2:8
8. stone of stumbling, &c.—quoted from Isa 8:14. Not merely they stumbled, in that their prejudices were offended; but their stumbling implies the judicial punishment of their reception of Messiah; they hurt themselves in stumbling over the corner-stone, as "stumble" means in Jer 13:16; Da 11:19.
at the word—rather, join "being disobedient to the word"; so 1Pe 3:1; 4:17. whereunto—to penal stumbling; to the judicial punishment of their unbelief. See above. also—an additional thought; God's ordination; not that God ordains or appoints them to sin, but they are given up to "the fruit of their own ways" according to the eternal counsel of God. The moral ordering of the world is altogether of God. God appoints the ungodly to be given up unto sin, and a reprobate mind, and its necessary penalty. "Were appointed," Greek, "set," answers to "I lay," Greek, "set," 1Pe 2:6. God, in the active, is said to appoint Christ and the elect (directly). Unbelievers, in the passive, are said to be appointed (God acting less directly in the appointment of the sinner's awful course) [BENGEL]. God ordains the wicked to punishment, not to crime [J. CAPPEL]. "Appointed" or "set" (not here "FORE-ordained") refers, not to the eternal counsel so directly, as to the penal justice of God. Through the same Christ whom sinners rejected, they shall be rejected; unlike believers, they are by God appointed unto wrath as FITTED for it. The lost shall lay all the blame of their ruin on their own sinful perversity, not on God's decree; the saved shall ascribe all the merit of their salvation to God's electing love and grace.