How many accounts of first-hand witnesses do we have every time God spoke the Law to Moses from the Holy Place?
(Lev 1:1, 4:1, 5:14, 6:1, 8, 19, 24, 7:22, 28, 8:1, 12:1, 14:1, 16:1, 2, 17:1, 18:1, 19:1, 20:1, 21:1, 16, 22:1, 17, 26, 23:1, 9, 23, 26, 33, 24:1, 27:1:1; Nu 1:1, 4:21, 5:1, 11, 6:1, 22, 8:1, 5, 23, 9:1, 10:1, 11:16, 23, 13:1, 15:1, 17, 37, 17:1, 18:25, 21:8, 34, 25:4, 10, 16, 26:52, 27:12, 18, 28:1, 31:1, 25, 34:1, 16, etc., etc., etc.)
Or spoke to Balaam (Nu 22:9, 12, 20, 23:16), etc.?
Does that keep you from believing that God did speak what is recorded of him?
This is misunderstanding, misusing and employing a double standard,
regarding the Biblical requirment of two or three witnesses,
which applies only to testimony regarding wrongdoing (Nu 35:30; Dt 17:6, 19:15; Mt 18:16; 1Tim 5:19; Heb 10:28).
And with your wrong requirement of two to three witnesses to the event,
you set at naught 99% of Leviticus, Numbers, the Prophets, etc., because there were no witnesses to it.
Likewise, your wrong requirments sets at naught Paul's call by the risen Christ to be an apostle (Gal 1:1; 1Ti 1:1).
And then there's the double standard of applying your wrong requirement to NT events, but not to OT events, such as God speaking to Balaam.
This is a grasping at straws of human rationale and double standards, with no Biblical foundation for your rejection of most of the NT Word of God.
Good luck with that.