There Are Three Sources of Prophecy:

1.     God through the Holy Spirit (Acts 3:21; 2 Tim. 3:15-17; Hebrews 1:1-2; 1 Peter 1:10-13; 2 Peter 1:21)

2.     Satan through demon inspiration (Genesis 3:4-5; 1 Samuel 28; 1 Kings 22; 1 Chron. 10:13-14; Matthew 24:24; 2 Thes. 2:8-12; Rev. 13:11-18; Rev. 16:13-16; Rev. 19:20)

3.     Man's own personal spirit (Deut. 13:1-18; Deut. 18:20-21; Jeremiah 23:15-17,25-40; Jeremiah 27:9-11,14-18; Jeremiah 28:1-17; Ezekiel 13:1-23; Ezekiel 22:23-31 1 Cor 14:29-33)

Fulfilled prophecy is generally accepted as being from God (Deut. 18:22), but even this test is not absolute. Deut. 13:1-3 states that God may allow a sign from a false prophet to come to pass, to see if His people will act contrary to His own Word. Therefore, the real test is if a prophecy is in harmony with the Word of God. Anything contrary to the Word is false, for God will never contradict Himself.