2 John 1:9

9Anyoneπᾶςὁgoing on aheadπροάγωνandκαὶnotμὴabidingμένωνinἐνtheτῇteachingδιδαχῇτοῦof ChristΧριστοῦGodθεὸνnotοὐκhasἔχει·The [one]ὁabidingμένωνinἐνtheτῇteachingδιδαχῇ,this [one]οὗτοςbothκαὶtheτὸνFatherπατέραandκαὶtheτὸνSonυἱὸνhasἔχει.

Everyone going on ahead and not remaining in the teaching of Christ does not have God. The one remaining in the teaching, this one has both the Father and the Son.