Listen to I Know Whom I Have Believed online. I Know Whom I Have Believed is an English language song and is sung by The Celebration Choir. I Know Whom I Have Believed, from the album The Hymn Makers: Ira D. Sankey Vol 2 (Wonderful Words of Life), was released in the year 1999. The duration of the song is 3:20. Download English songs online from JioSaavn.