I'll share what Bible says about the Covenant and its relation to the Millennial Kingdom.
(The restoration of the kingdom of God for 1000 years).
The distinction between dispensation of Millennial Kingdom with dispensation of Grace:
-Satan is bound and cast into the bottomless pit for 1000 years (Rev 20:2-3)
-The true King reigns for 1000 years in righteousness (Rev 20:4)
-Wild animals turns to be tame And nature is beautifully peaceful (Isaiah 11:6-9; 55:12-13)
-The earth is filled with the glory of the knowledge of the ＬＯＲＤ (Habakkuk 2:14).
The restoration of the Kingdom of God has nothing to do with gentiles, because it relates to:
"And thine house and thy kingdom shall be established for ever before thee: thy throne shall be established for ever." (verse 16).
"He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David." (Luke 1:32/KJV).
3. Associated with God's promise that Israel will become one nation again (Ezekiel 37:22).