Josephus Flavius, The Antiquities of the Jews XVIII 6.7 and XIX 8.2
Now Agrippa stood in his bonds before the royal palace, and leaned on a certain tree for grief, with many others, who were in bonds also; and as a certain bird sat upon the tree on which Agrippa leaned (the Romans call this bird bubo, an owl), one of those that were bound, a German by nation, saw him, and asked a soldier who that man in purple was; and when he was informed that his name was Agrippa, and that he was by nation a Jew, and one of the principal men of that nation, he asked leave of the soldier to whom he was bound, to let him come nearer to him, to speak with him; for that he had a mind to inquire of him about some things relating to his country; which liberty, when he had obtained, and as he stood near him, he said thus to him by an interpreter: "This sudden change of thy condition, O young man! is grievous to thee, as bringing on thee a manifold and very great adversity; nor wilt thou believe me, when I foretell how thou wilt get clear of this misery which thou art now under, and how Divine Providence will provide for thee. Know therefore (and I appeal to my own country gods, as well as to the gods of this place, who have awarded these bonds to us) that all I am going to say about thy concerns shall neither be said for favor nor bribery, nor out of an endeavor to make thee cheerful without cause; for such predictions, when they come to fail, make the grief at last, and in earnest, more bitter than if the party had never heard of any such thing. However, though I run the hazard of my own self, I think it fit to declare to thee the prediction of the gods. It cannot be that thou shouldst long continue in these bonds; but thou wilt soon be delivered from them, and wilt be promoted to the highest dignity and power, and thou wilt be envied by all those who now pity thy hard fortune; and thou wilt be happy till thy death, and wilt leave thine happiness to the children whom thou shalt have. But do thou remember, when thou seest this bird again, that thou wilt then live but five days longer. This event will be brought to pass by that God who hath sent this bird hither to be a sign unto thee. And I cannot but think it unjust to conceal from thee what I foreknow concerning thee, that, by thy knowing beforehand what happiness is coming upon thee, thou mayst not regard thy present misfortunes. But when this happiness shall actually befall thee, do not forget what misery I am in myself, but endeavor to deliver me." So when the German had said this, he made Agrippa laugh at him as much as he afterwards appeared worthy of admiration.
Continued in Book XIX 8.2:
Now when Agrippa had reigned three years over all Judea, he came to the city Caesarea, which was formerly called Strato's Tower; and there he exhibited shows in honor of Caesar, upon his being informed that there was a certain festival celebrated to make vows for his safety. At which festival a great multitude was gotten together of the principal persons, and such as were of dignity through his province. On the second day of which shows he put on a garment made wholly of silver, and of a contexture truly wonderful, and came into the theater early in the morning; at which time the silver of his garment being illuminated by the fresh reflection of the sun's rays upon it, shone out after a surprising manner, and was so resplendent as to spread a horror over those that looked intently upon him; and presently his flatterers cried out, one from one place, and another from another, (though not for his good,) that he was a god; and they added, "Be thou merciful to us; for although we have hitherto reverenced thee only as a man, yet shall we henceforth own thee as superior to mortal nature." Upon this the king did neither rebuke them, nor reject their impious flattery. But as he presently afterward looked up, he saw an owl sitting on a certain rope over his head, and immediately understood that this bird was the messenger of ill tidings, as it had once been the messenger of good tidings to him; and fell into the deepest sorrow. A severe pain also arose in his belly, and began in a most violent manner. He therefore looked upon his friends, and said, "I, whom you call a god, am commanded presently to depart this life; while Providence thus reproves the lying words you just now said to me; and I, who was by you called immortal, am immediately to be hurried away by death. But I am bound to accept of what Providence allots, as it pleases God; for we have by no means lived ill, but in a splendid and happy manner." When he said this, his pain was become violent. Accordingly he was carried into the palace, and the rumor went abroad every where, that he would certainly die in a little time. But the multitude presently sat in sackcloth, with their wives and children, after the law of their country, and besought God for the king's recovery. All places were also full of mourning and lamentation. Now the king rested in a high chamber, and as he saw them below lying prostrate on the ground, he could not himself forbear weeping. And when he had been quite worn out by the pain in his belly for five days, he departed this life, being in the fifty-fourth year of his age, and in the seventh year of his reign; for he reigned four years under Caius Caesar, three of them were over Philip's tetrarchy only, and on the fourth he had that of Herod added to it; and he reigned, besides those, three years under the reign of Claudius Caesar; in which time he reigned over the forementioned countries, and also had Judea added to them, as well as Samaria and Cesarea. The revenues that he received out of them were very great, no less than twelve millions of drachme. Yet did he borrow great sums from others; for he was so very liberal that his expenses exceeded his incomes, and his generosity was boundless.