The spoken letter "bet" of "tov" coalesces so to speak with the letter "vav" of "vayavdeil" to make one sound -- the sound of the blowing windsefaria.org/Genesis.1.4?ve…
In fact it is the case with all following "tov"s in Genesis 1, "bet" of "tov" followed by a "vav"
The wind blowing through the six days of creation!
Except for the last , which is not followed by a "vav" but by a "mem"
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.
Verily I say unto you, This generation shall not pass, till all these things be fulfilled. Heaven and earth shall pass away, but my words shall not pass away.
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