“When Jesus had finished
The crowds were astonished
At his teaching,”
Καὶ ἐγένετο ὅτε ἐτέλεσεν ὁ Ἰησοῦς τοὺς λόγους τούτους, ἐξεπλήσσοντο οἱ ὄχλοι ἐπὶ τῇ διδαχῇ αὐτοῦ
Matthew has a transition phrase, that also was in Luke, chapter 7:1. Mark also has something like in chapter 1:21. Jesus seems to have finished these sayings (Καὶ ἐγένετο ὅτε ἐτέλεσεν ὁ Ἰησοῦς τοὺς λόγους τούτους) or the sermon on the Mount. The crowds of people were astonished or amazed (ἐξεπλήσσοντο οἱ ὄχλοι) at his teaching (ἐπὶ τῇ διδαχῇ αὐτοῦ). Clearly, Jesus made a big impression.