Hb 1:5 Interlinear NA27
εἶπεν αὐτοῖς ὁ Ἰησοῦς• εἰ ὁ θεὸς πατὴρ ὑμῶν ἦν ἠγαπᾶτε ἂν ἐμέ, ἐγὼ γὰρ ἐκ τοῦ θεοῦ ἐξῆλθον καὶ ἥκω• οὐδὲ γὰρ ἀπ’ ἐμαυτοῦ ἐλήλυθα, ἀλλ’ ἐκεῖνός με ἀπέστειλεν. John 8:42
ἐκ τοῦ θεοῦ > coming from within God
Jesus is the one who comes out of God and the first to return into God, because many will be one.
Note that the Septuagint uses the preposition πρὸς in Ecclesiastes 12:7 “…πρὸς τὸν θεόν...”
then [3 shall return 1 the 2 dust] upon the earth as it was; and the spirit should return to next of God who gave it. Ecclesiastes 12:7
Dodson Greek-English Lexicon G4314 πρός PREPosition to, towards, with
Jesus being in God, the single, is impossible other than God.
καὶ ἔσομαι ὑμῖν εἰς πατέρα καὶ ὑμεῖς ἔσεσθέ μοι εἰς υἱοὺς καὶ θυγατέρας, λέγει κύριος παντοκράτωρ. (2Co 6:18 [NA28])
We will all be one God in God.