John Gill

And they said one to another,.... According to the Targum of Jonathan, Simeon and Levi said what follows: nor is it unlikely, since they were hot, passionate, cruel, and bloody minded men, as appears by the affair of Shechem; and perhaps this may be the reason why Joseph afterwards, when governor of Egypt, took Simeon and bound him, Gen 42:24; which was but a just retaliation for his advice to cast him into a pit when slain: behold, this dreamer cometh; or "master of dreams" (r); not of the interpretation of them, but of dreaming them; that had them at his command when he pleased, as they jeeringly flouted him; as if he was a framer and contriver of them, and only pretended to them when he had none, or else that he was frequently dreaming and telling his dreams; this they said in a sarcastic way, and, perhaps, as pleased, and rejoicing that such an opportunity offered to take their revenge on him: this shows that it was on the account of his dreams chiefly that they bore such a grudge against him, that this was uppermost on their minds, and was revived at first sight of him, and from whence their malice sprung. (r) "magister somniorum", Tigurine version, Montanus; "dominus somniorum", Vatablus, Junius & Tremellius.