By my count, Isaiah is referenced (quoted or alluded to): 21 times in the Gospels; 25 times in Paul’s letters; 6 times in 1 Peter; 5 times in Acts; 4 times in Revelation; and once in Hebrews.
The New Testament is our divinely inspired commentary on the Old Testament. When studying a passage, it’s often helpful to see how other biblical authors understood it. Here is the Apostle Peter’s use of the Old Testament in his letters.
Quotations and allusions to the Old Testament book of Jeremiah found in the New Testament.