Introduction:
Zadok the priest is a significant figure in the history of Israel, known for his unwavering loyalty to King David and his role in the establishment of Solomon as king. His lineage and service are pivotal in the religious and political landscape of ancient Israel.

Lineage and Early Life:
Zadok was a descendant of Aaron, the brother of Moses, through Eleazar, Aaron's son. This lineage established him within the Levitical priesthood, a hereditary line responsible for the religious duties and rituals of Israel. Zadok's father was Ahitub, and he was a contemporary of Abiathar, another priest during King David's reign.

Service under King David:
Zadok first appears in the biblical narrative during the reign of King David. He is noted for his loyalty and support during Absalom's rebellion. When David fled Jerusalem, Zadok, along with Abiathar, brought the Ark of the Covenant to David. However, David instructed them to return the Ark to the city, indicating his trust in God's plan and his confidence in Zadok's faithfulness (2 Samuel 15:24-29).

Zadok's loyalty is further demonstrated during the conspiracy of Adonijah, David's son, who attempted to usurp the throne. Zadok remained faithful to David and supported Solomon, David's chosen successor. This allegiance was crucial in securing Solomon's kingship (1 Kings 1:8, 1:32-39).

Anointing of Solomon:
Zadok played a central role in the anointing of Solomon as king. At David's command, Zadok, along with Nathan the prophet and Benaiah son of Jehoiada, took Solomon to Gihon. There, Zadok anointed Solomon with oil from the sacred tent, officially establishing him as king over Israel (1 Kings 1:39). This act was significant in affirming the divine choice of Solomon and ensuring the continuation of David's dynasty.

Role in Solomon's Reign:
Under Solomon, Zadok continued to serve as a high priest. His position was solidified when Solomon removed Abiathar from the priesthood, fulfilling the prophecy against the house of Eli (1 Kings 2:26-27). Zadok's priesthood was marked by stability and continuity, as he served alongside the king in the newly constructed Temple in Jerusalem.

Legacy:
Zadok's legacy is profound, as his descendants continued to serve in the priesthood for generations. The "sons of Zadok" are mentioned in the book of Ezekiel as faithful priests who maintained the sanctity of the Temple and the worship of Yahweh (Ezekiel 44:15). This enduring legacy highlights the importance of Zadok's faithfulness and the divine favor upon his lineage.

Conclusion:
Zadok the priest stands as a model of loyalty, faithfulness, and divine service. His role in the anointing of Solomon and his steadfast support of David's house underscore his significance in the biblical narrative and the history of Israel's priesthood.