Up till now "Sedeq" was generally interpreted as -justice- and "Sedaqah" as -righteousness- without using comparative research to go beyond the dogmatic interpretation. This first-time in-depth research has shown not only that the three genres (Narrative, Wisdom and the Prophets) use both terms as two separate distinct meanings, but also a clear development and branching-out of meanings (especially of "Sedaqah") throughout the Biblical era, a period of about 1000 years. It has also found a definite inter-dependency and influence between Wisdom and the Prophets literatures. "Sedeq" and "Sedaqah" are concepts in terms of relationships: between man and man according to social customs and norms, and between man and God according to a special covenant. Contrary to prior interpretation and to the contemporary meaning, there is no evidence that the Biblical "Sedaqah" took the meaning of -Charity.-"