John Wesley on Jeremiah 10:2

Learn not - The Jews being to live among the Chaldeans in their captivity, where many of them were already, the prophet admonishes them against the Chaldean idolatries, who were all much addicted to astrology. The signs - This was so common among them, that Judicial astrologers, of what nation soever, were generally termed Chaldeans. The Heathen - Leave this to Heathens; it doth not become God's people.