Targum su Esodo 17:8

And Amalek came from the land of the south and leaped on that night a thousand and six hundred miles; and on account of the disagreement which had been between Esau and Jakob, he came and waged war with Israel in Rephidim, and took and killed (some of the) men of the house of Dan; for the cloud did not embrace them, because of the strange worship that was among them.