Luke 9:33

33 καὶ ἐγένετο ἐν τῷ διαχωρίζεσθαι αὐτοὺς ἀπ’ αὐτοῦ εἶπεν ὁ Πέτρος πρὸς τὸν Ἰησοῦν · Ἐπιστάτα, καλόν ἐστιν ἡμᾶς ὧδε εἶναι, καὶ ποιήσωμεν σκηνὰς τρεῖς, μίαν σοὶ καὶ μίαν Μωϋσεῖ καὶ μίαν Ἠλίᾳ, μὴ εἰδὼς ὃ λέγει.

Luke 9:33 Meaning and Commentary

Luke 9:33

And it came to pass, as they departed from him
That is, as Moses and Elias departed from Christ; or "when they began to depart", as the Syriac version renders it; or "would depart", as the Arabic and Persic versions; seemed desirous of going, or made some signal or other by which the disciples perceived they were about to go; for, as yet, they were not gone;

Peter said unto Jesus, master, it is good for us to be here, let us
make three tabernacles, one for thee, and one for Moses, and one for
Elias; (See Gill on Matthew 17:4)

not knowing what he said,
nor "what to say", as Mark observes, being in a surprise, and not in a situation to consider and weigh things well, whether what he said was right and proper, or not; (See Gill on Matthew 17:4)

Luke 9:33 In-Context

31 οἳ ὀφθέντες ἐν δόξῃ ἔλεγον τὴν ἔξοδον αὐτοῦ ἣν ἤμελλεν πληροῦν ἐν Ἰερουσαλήμ.

32 ὁ δὲ Πέτρος καὶ οἱ σὺν αὐτῷ ἦσαν βεβαρημένοι ὕπνῳ · διαγρηγορήσαντες δὲ εἶδον τὴν δόξαν αὐτοῦ καὶ τοὺς δύο ἄνδρας τοὺς συνεστῶτας αὐτῷ.

33 καὶ ἐγένετο ἐν τῷ διαχωρίζεσθαι αὐτοὺς ἀπ’ αὐτοῦ εἶπεν ὁ Πέτρος πρὸς τὸν Ἰησοῦν · Ἐπιστάτα, καλόν ἐστιν ἡμᾶς ὧδε εἶναι, καὶ ποιήσωμεν σκηνὰς τρεῖς, μίαν σοὶ καὶ μίαν Μωϋσεῖ καὶ μίαν Ἠλίᾳ, μὴ εἰδὼς ὃ λέγει.

34 ταῦτα δὲ αὐτοῦ λέγοντος ἐγένετο νεφέλη καὶ ἐπεσκίαζεν αὐτούς · ἐφοβήθησαν δὲ ἐν τῷ εἰσελθεῖν αὐτοὺς ⸃ εἰς τὴν νεφέλην.

35 καὶ φωνὴ ἐγένετο ἐκ τῆς νεφέλης λέγουσα · Οὗτός ἐστιν ὁ υἱός μου ὁ ἐκλελεγμένος, αὐτοῦ ἀκούετε.