New Defender's Study Bible Notes
2:8 rock of offence. In the meantime, until He is made the head stone (Zechariah 4:7), Christ is just a stumbling stone on the ground, as it were, getting in the way of everyone who would pass by. Peter here quotes Isaiah 8:14, to which Jesus also referred in the same vein (Matthew 21:42-44). But note also Daniel 2:34 and Jeremiah 13:16.