They glorified God.
They praised God
For all they had heard
Just as it had been told
καὶ ὑπέστρεψαν οἱ ποιμένες δοξάζοντες καὶ αἰνοῦντες τὸν Θεὸν ἐπὶ πᾶσιν οἷς ἤκουσαν καὶ εἶδον καθὼς ἐλαλήθη πρὸς αὐτούς.
Luke said that these shepherds returned to their flocks of sheep (καὶ ὑπέστρεψαν οἱ ποιμένες). They glorified (δοξάζοντες) and praised God (καὶ αἰνοῦντες τὸν Θεὸν) for all they had heard (ἐπὶ πᾶσιν οἷς ἤκουσαν) and seen (καὶ εἶδον), just as it had been told to them (καθὼς ἐλαλήθη πρὸς αὐτούς). These shepherds appear to be stand-ins for the people of Israel. They had all this information about the baby child Messiah, Christ, Savior, and Lord. They had actually seen him as they had glorified and praised God. Nevertheless, they seemed to go about their business, as if nothing had happened.