3 in the scriptures means Divine, or complete.  We have the promise that God will confirm all truth in the mouth of two or three witnesses.  The God head is 3 people. Jonah was in the belly of the whale, cried out to God from the "depths of Hell" and was "vomited" by the fish back onto dry land.  Alma the younger tells his son Helaman he was 3 days in the "darkest abyss." When he seemed to remember one Jesus Christ whom his father had testified of. The pains are swept away and Joy fills his heart! Alma spends the rest of his life trying to help others feel the joy he felt from God's gift of repentance. Jonah did not.