Verse 1
48:1 Hear ye this, O house of Jacob, who are {a} called by the name of Israel, and have come forth out of {b} the waters of Judah, who swear by the name of the LORD, and make mention of the God of Israel, [but] not in truth, nor in righteousness.
(a) He detects their hypocrisy who claimed to be Israelites, but were not so.
(b) Meaning, the fountain and stock.