The Hebrew noun aruvon means pledge, surety, or a deposit given as guarantee — the collateral a person offers to back a promise. It appears only 3 times in the Old Testament, all in Genesis 38, in the story of Judah and Tamar, yet it carries significant theological weight in biblical typology.
The three occurrences of aruvon all appear in Genesis 38:17–20, where Judah promises his signet, cord, and staff as pledges to Tamar. The story is scandalous by surface reading, yet within the biblical narrative arc, it is pivotal: Tamar's son Perez becomes an ancestor of David and ultimately of Jesus (Matthew 1:3). The concept of pledge finds its fullest theological expression in the NT Greek word arrabon (the same Semitic root), which Paul uses three times (2 Corinthians 1:22; 5:5; Ephesians 1:14) to describe the Holy Spirit as God's deposit, His pledge and down-payment guaranteeing our full inheritance. The Spirit given to believers is not the whole blessing — it is God's personal guarantee that every promised blessing will be delivered. The ancient commercial metaphor of a pledge becomes the language of eschatological assurance.