The Meaning of Numbers: The Number 51
Book number 51 in the KJV Bible translation (and most modern translations) is Colossians. The Apostle Paul authored the book between 61 and 63 A.D. during his most productive writing period. During this time span he also penned the epistles to the Ephesians and Philippians as well as his letter to Philemon.
In 51 A.D. the Apostle Paul wrote 2Thessalonians, his second of fourteen Biblical books. The Apostle also turned 51 years old in 53 A.D., the year in which he began his third evangelistic journey to preach the gospel.
Appearances of the number fifty-one
Solomon's three books, Proverbs, Ecclesiates and the Song of Solomon, have a grand total of 51 chapters.
Number 51 and King David
Psalm 51 is one of the most heart-wrenching and contrite songs in all Scripture. It's profound meaning is derived from its author, King David, who wrote it shortly after he was confronted by the prophet Nathan regarding his adultery with Bathsheba. His illicit affair led him to arrange the murder of her husband Uriah in order to cover up his sin and the fact that he got Bathsheba pregnant.
David's deep repentance and earnest prayer for forgiveness for his gross sins is exemplified in the following verses.
Have mercy upon me, O God, according to Your lovingkindness; according to the greatness of Your compassion, blot out my transgressions. Wash me thoroughly from my iniquity, and cleanse me from my sin . . .
Purge me with hyssop, and I shall be clean; wash me, and I shall be whiter than snow . . .
Deliver me from the guilt of shedding blood, O God, O God of my salvation . . . (Psalm 51:1 - 2, 7, 14).
Although forgiven, David's sin brought the consequences of internal strife within his household for the rest of his life (2Samuel 12:10 - 11).
Additional info on Biblical Meaning of 51
Biblical chapters in the KJV translation that number exactly 51 verses include Exodus 12, Numbers 3, Joshua 19, 2Samuel 22, 1Kings 7, Matthew 24 and John 1.