From the Jack Van Impe website
The moderator of a radio call-in program in Illinois had Dr. Van Impe for a guest. He hated Christianity and claimed to believe only the Old Testament. When the broadcast started, he announced that even though this was a call-in show, he would accept no calls from listeners because he wanted to use the entire hour to tear the evangelist to shreds. He started his tirade by saying, "I can't accept the three-headed God of Christians." In other words, he rejected and mocked the Trinity.
"Well, sir," said Jack, "since you believe only the Old Testament, I'll show you what that part of the Bible has to say about the Trinity."
Beginning then at Genesis 1:1 and showing that the very first mention of God is given in the plural Hebrew word Elohim, he moved through the Old Testament revealing the truth about the Trinity.
He pointed out that the plural word for God (Elohim), was used again at the creation of man (see Genesis 1:26), the Lord has a Son (see Proverbs 30:4), that the Lord speaks to the Lord (see Psalm 110:1), and that the Lord spoke of sending the Lord to the earth (see Zechariah 2:10,11).
At that point, the distressed disc jockey decided it was time to open the program to the calls of listeners.
Yeah send me what you got, I have a whole bible full of scriptures to show that Jesus is God, the second godhead of the trinity. I believe in one God! but as the father, the son, and the holy ghost.