Flavius Josephus, The Life of Flavius Josephus
William Whiston, A.M., Ed.

[179] But before this, it happened that Philip, the son of Jacimus, went out of the citadel of Gamala upon the following occasion: When Philip had been informed that Varus was put out of his government by king Agrippa, and that Equieulus Modius, a man that was of old his friend and companion, was come to succeed him, he wrote to him, and related what turns of fortune he had had, and desired him to forward the letters he sent to the king and queen. Now, when Modius had received these letters, he was exceedingly glad, and sent the letters to the king and queen, who were then about Berytus. But when king Agrippa knew that the story about Philip was false, (for it had been given out, that the Jews had begun a war with the Romans, and that this Philip had been their commander in that war,) he sent some horsemen to conduct Philip to him; and when he was come, he saluted him very obligingly, and showed him to the Roman commanders, and told them that this was the man of whom the report had gone about as if he had revolted from the Romans. He also bid him to take some horsemen with him, and to go quickly to the citadel of Gamala, and to bring out thence all his domestics, and to restore the Babylonians to Batanea again. He also gave it him in charge to take all possible care that none of his subjects should be guilty of making any innovation. Accordingly, upon these directions from the king, he made haste to do what he was commanded.