18 And when John the Baptist heard about all these things, he was scandalized. 19 And John calling unto him a certain two of his disciples sent them to Jesus, saying, Art thou he that cometh? or look we for another?
(*Ev 7:18-19)
...is based on Vita 25 of Josephus:
25. But when John, the son of Levi, who, as we before told you, abode at Gischala, was informed how all things had succeeded to my mind; and that I was much in favour with those that were under me; as also that the enemy were greatly afraid of me; he was not pleased with it, as thinking my prosperity tended to his ruin. So he took up a bitter envy and enmity against me. And hoping that, if he could inflame those that were under me to hate me, he should put an end to the prosperity I was in, he tried to persuade the inhabitants of Tiberias, and of Sepphoris (and for those of Gabara he supposed they would be also of the same mind with the others,) which were the greatest cities of Galilee, to revolt from their subjection to me, and to be of his party: and told them, that he would command them better than I did.
https://penelope.uchicago.edu/josephus/autobiog.html
Josephus reports that John of Gischala was scandalized at the news about his own [of Josephus] success, but note that when Josephus was on the side of the rebels, officially he commanded Jesus ben Sapphat, hence the success of the latter were officially the success of Josephus.