A witness is someone who not only knows about information but has a conviction about the implications of the information. Acts 1:1-11 teaches us a lot about what it means to be a witness.
Scripture Reference: Acts 1:1-11, Acts 1:3, Luke 24:39-43, John 9, Acts 1:4-5, Acts 2:1-6, Deuteronomy 19-15, 2 Corinthians 13:1, Acts 1:8, Acts 2:42; 8:3-4; 12:25, Genesis 22:17-18, 1 Timothy 2:3-4, Revelation 7:9, Acts 1:9-11