Read to show that 'proclaiming the good news' in Luke refers to Jesus teaching publicly, not preaching some separate lost gospel.
Scripture spotlight
Luke 20:1-8
bible
1 It happened on one of those days, as he was teaching the people in the temple and preaching the Gospel, that the priests and scribes came to him with the elders. 2 They asked him, "Tell us: by what authority do you do these things? Or who is giving you this authority?" 3 He answered them, "I also will ask you one question. Tell me: 4 the baptism of John, was it from heaven, or from men?" 5 They reasoned with themselves, saying, "If we say, 'From heaven,' he will say, 'Why didn't you believe him?' 6 But if we say, 'From men,' all the people will stone us, for they are persuaded that John was a prophet." 7 They answered that they didn't know where it was from. 8 Jesus said to them, "Neither will I tell you by what authority I do these things."