24 Then Jehu drew his bow and shot Joram between the shoulders. The arrow pierced his heart, and he slumped down in his chariot.
25And Jehu said to Bidkar his officer, “Pick him up and throw him into the field of Naboth the Jezreelite. For remember that when you and I were riding together behind his father Ahab, the LORD lifted up this burden against him: 26‘As surely as I saw the blood of Naboth and the blood of his sons yesterday, declares the LORD, so will I repay you on this plot of ground, declares the LORD.’ Now then, according to the word of the LORD, pick him up and throw him on the plot of ground.”
2 Kings 9:24-26 (BSB)
Is Jehu a prophet? If not, why does he use the phrase "declares the LORD" in 2 Kings 9:26?