21:13 ἰδοὺ ἐγὼ πρὸς σὲ τὸν κατοικοῦντα τὴν κοιλάδα Σορ τὴν πεδινὴν τοὺς λέγοντας τίς πτοήσει ἡμᾶς ἢ τίς εἰσελεύσεται πρὸς τὸ κατοικητήριον ἡμῶν
But it does not mean " I am with you" or "I am at your house" etc., rather it means "I am AGAINST you." So the Trinitarian reading at John 1:1b is diabolical indeed, since they take both the singular substantives as individuals:
"In the beginning was the Word, and the Word was against God, and the Word was Himself God."
The way to say that one person is "with" another person using the verb εἰμί in Greek is NOT with πρὸς + accusative (that denotes the exact opposite), but with μετὰ and genitive.
ὃς ἦν μετὰ σοῦ........