Matthew 17:11

He answered and said, “Elijah is coming and will restore all things;

Luke 1:16-17

He will turn many of the sons of Israel back [from sin] to [love and serve] the Lord their God.

Malachi 4:6

He will turn the hearts of the fathers to their children, and the hearts of the children to their fathers [a reconciliation produced by repentance], so that I will not come and strike the land with a curse [of complete destruction].”

Acts 3:21

whom heaven must keep until the time for the [complete] restoration of all things about which God promised through the mouth of His holy prophets from ancient time.

Luke 3:3-14

And he went into all the country around the Jordan, preaching a baptism of repentance for the forgiveness of sin;

Treasury of Scripture Knowledge

Summary

And Jesus answered and said unto them, Elias truly shall first come, and restore all things.

General references

Bible References

And restore

Malachi 4:6
He will turn the hearts of the fathers to their children, and the hearts of the children to their fathers [a reconciliation produced by repentance], so that I will not come and strike the land with a curse [of complete destruction].”
Luke 1:16
He will turn many of the sons of Israel back [from sin] to [love and serve] the Lord their God.
Luke 3:3
And he went into all the country around the Jordan, preaching a baptism of repentance for the forgiveness of sin;
Acts 3:21
whom heaven must keep until the time for the [complete] restoration of all things about which God promised through the mouth of His holy prophets from ancient time.

General references

Mark 9:11
They asked Him, saying, “Why do the scribes say that Elijah must come first [before the Messiah comes]?”