Isaiah 8:2

And I took unto me faithful witnesses to record, Uriah the priest, and Zechariah the son of Jeberechiah.

Cross-reference

2 Kings 16:10 shows Uriah the priest involved in Ahaz's idolatry, contrasting his designation as a faithful witness in Isaiah.

In 2 Kings 16:11, Uriah builds the pagan altar for Ahaz, further contrasting with his role as a faithful witness.

In 2 Corinthians 13:1, Paul cites the principle of two or three witnesses, which Isaiah exemplifies by taking two witnesses.

Jeremiah 32:10 describes a legal transaction with witnesses, similar to Isaiah appointing witnesses for a prophetic testimony.