κατὰ τὸ ῥῆμά σου
also in Luke 1:38
εἶπεν δὲ Μαριάμ, Ἰδοὺ ἡ δούλη κυρίου· γένοιτό μοι κατὰ τὸ ῥῆμά σου. καὶ ἀπῆλθεν ἀπ' αὐτῆς ὁ ἄγγελος. esv.org/Luke+1/
and I bet it builds on Deuteronomy 8 cited in Matthew 4:4,
ὁ δὲ ἀποκριθεὶς εἶπεν, Γέγραπται, Οὐκ ἐπ' ἄρτῳ μόνῳ ζήσεται ὁ ἄνθρωπος, ἀλλ' ἐπὶ παντὶ ῥήματι ἐκπορευομένῳ διὰ στόματος θεοῦ.
John 1:15,
Ἰωάννης μαρτυρεῖ περὶ αὐτοῦ (= the word that became flesh)
καὶ κέκραγεν λέγων, Οὗτος ἦν ὃν εἶπον, Ὁ ὀπίσω μου ἐρχόμενος ἔμπροσθέν μου γέγονεν, ὅτι πρῶτός μου ἦν
Οὗτος ἦν also in John 1:2,
οὗτος ἦν ἐν ἀρχῇ πρὸς τὸν θεόν
cf. Rashi on Genesis 1:1
in the beginning it was his intention to create it with the standard of justice, but he perceived that the world would not endure; so he preceded it with the standard of mercy, allying it with the standard of justice
Although man only was created on the sixth day, as resurrected one he was already present on the first, because of which the first day was called "yom echad" = day one
Rashi:
Why does it write אחד “one”? Because the holy one, blessed be he, was only one (יָחִיד "yachid") in his world, since the angels were not created until the second day.