Behold, it is written before Me: I will not keep silent, but I will repay; I will pay it back into their laps,
The apostle Paul (an expositor we may depend upon) has given us the true sense of these verses, and told us what was the event they pointed at and were fulfilled in, namely, the calling in of the Gentiles and the rejection of the Jews, by the preaching of the gospel, Rom 10:20, Rom 10:21.
Commenting on Isaiah 65:1-7
Behold, it is written before me,.... This account of their sins; it was in his sight and constant remembrance, and punishment for them was determined by him, written in the book of his decrees: I will not keep silence; but threaten with destruction, and not only threaten, but execute; plead against them really, as well as verbally, with sore judgments: but will recompense, even recompense...
written before me--"it is decreed by Me," namely, what follows (Job 13:26), [MAURER]; or, their guilt is recorded before Me (compare Dan 7:10; Rev 20:12; Mal 3:16). into . . . bosom-- (Psa 79:12; Jer 32:18; Luk 6:38). The Orientals used the loose fold of the garment falling on "the bosom" or lap, as a receptacle for carrying things.