Contradiction with Matthew 28:19
This verse instructs the disciples to go and teach all nations, whereas Luke 2:17 describes the shepherds spreading news only locally after Jesus' birth and not globally proclaiming.
Matthew 28:19: Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: [teach...: or, make disciples, or, Christians of all nations]
Contradiction with Mark 7:36
Jesus commands people not to tell others of his miracles, contrasting with the shepherds freely spreading the news in Luke 2:17.
Mark 7:36: And were beyond measure astonished, saying, He hath done all things well: he maketh both the deaf to hear, and the dumb to speak.
Contradiction with John 2:4
Jesus initially refrains from revealing his power at the wedding, unlike the shepherds' immediate proclamation in Luke 2:17.
John 2:4: Jesus saith unto her, Woman, what have I to do with thee? mine hour is not yet come.
Contradiction with Acts 1:7
Jesus speaks of times not to be known or discussed, differing from the shepherds openly sharing the news in Luke 2:17.
Acts 1:7: And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power.
Contradiction with Mark 1:44
Jesus instructs a healed man to show himself to the priest, not to others, contrary to the shepherds in Luke 2:17 speaking openly to all.
Mark 1:44: And saith unto him, See thou say nothing to any man: but go thy way, shew thyself to the priest, and offer for thy cleansing those things which Moses commanded, for a testimony unto them.