Interesting Topic Ezekiel 37:11-14 clearly speaks of a resurrection. And this resurrection must mark the beginning of God's purpose of gathering two people. (Northern and Southern Kingdoms which split into the Northern and Southern kingdoms after the death of Solomon)
2 Kings 17:18 Therefore the LORD was very angry with Israel, and removed them out of his sight: there was none left but the tribe of Judah only.
The house of Judah consisted of the tribes of Judah and Benjamin. The 10 other tribes were cast off.
The gathering of two people as one in Christ of which gathering Paul wrote in Ephesians 2:14-15. And since it was already a work of God in progress at the time Paul wrote to the Ephesians, the resurrection spoken of in Ezekiel 37 must precede the writing of that letter.
Great Sermon! Excellent insight into Ezekiel 37. This sermon is definitely worth the listen.