To deserted places
αὐτὸς δὲ ἦν ὑποχωρῶν ἐν ταῖς ἐρήμοις καὶ προσευχόμενος.
This is a unique saying about Jesus that is not found elsewhere. Luke said that Jesus would withdraw (αὐτὸς δὲ ἦν ὑποχωρῶν) to deserted places (ἐν ταῖς ἐρήμοις) to pray (καὶ προσευχόμενος). Notice the emphasis on the role of solitary prayer in Luke.
“After saying farewell,
He went up
On the mountain
καὶ ἀποταξάμενος αὐτοῖς ἀπῆλθεν εἰς τὸ ὄρος προσεύξασθαι.
This incident about Jesus praying alone can also be found in Matthew, chapter 14:23. After he had bid farewell to his disciples and the crowd (καὶ ἀποταξάμενος αὐτοῖς), Jesus went up the mountain (ἀπῆλθεν εἰς τὸ ὄρος) to pray (προσεύξασθαι). Jesus wanted to be alone with his Father to pray. It is not clear where this mountain was.