Jude said apostles’ writings were authoritative
Some Christians today believe only the actual spoken words of Jesus to be divinely inspired and to be taken as the authoritative word of God, and other Bible writings to be merely the words of man. This is not the way the early Christians viewed things. For example, Jude viewed the Apostles’ teachings and writings as authoritative Scripture, the word of God:
“But, dear friends, remember what the apostles of our Lord Jesus Christ foretold. They said to you, ‘In the last times there will be scoffers who will follow their own ungodly desires.'” (Jude 17-18)