1 Corinthians 14:29 NKJV)
29 Let two or three prophets speak, and let the others judge.
1 Thessalonians 5:19-22 (NKJV)
19 Do not quench the Spirit. 20 Do not despise prophecies. 21 Test all things; hold fast what is good. 22 Abstain from every form of evil. Blessing and Admonition
1 John 4:1-2 (NKJV)
1 Beloved, do not believe every spirit, but test the spirits, whether they are of God; because many false prophets have gone out into the world. 2 By this you know the Spirit of God: Every spirit that confesses that Jesus Christ has come in the flesh is of God
It seems testing and evaluating of prophesies was common and even commanded, if someone had the gift of prophecy and was prophesying, why would others test and evaluate his prophesies?