Charles Ellicott Commentary Ezekiel 37:19

"say unto them, Thus saith the Lord Jehovah: Behold, I will take the stick of Joseph, which is in the hand of Ephraim, and the tribes of Israel his companions; and I will put them with it, [even] with the stick of Judah, and make them one stick, and they shall be one in my hand." — Ezekiel 37:19 (ASV)

Which is in the hand of Ephraim.— Again Joseph stands for the whole ten tribes, and again it is indicated that the control of these was chiefly with Ephraim. The human power, which led to and perpetuated the division, is in contrast with mine hand, where all will be reunited under Divine rule.

Will put them.— Grammatically, the plural pronoun “them” refers to the piece of wood, which is singular; but the construction is according to the meaning, the wood representing the ten tribes.