Join them: some would have this done miraculously, but I do not think God bade the prophet work a miracle; were it so, God would rather have said, I will make them one, for he can do miracles. It was enough if glued together, or but held in his hand, so that in his hand they were one.
Related Commentaries of Ezekiel 37:17
Ezekiel 37:17
17 And join them one to another into one stick; and they shall become one in thine hand.