John Gill Commentary Ezra 2:68

"And some of the heads of fathers` [houses], when they came to the house of Jehovah which is in Jerusalem, offered willingly for the house of God to set it up in its place:" — Ezra 2:68 (ASV)

And some of the chief of the fathers, when they came to the
house of the Lord that is at Jerusalem
That is, when they came to the place where it formerly stood, and where were still the ruins of it:

offered freely for the house of God, to set it up in its place ;
to rebuild it upon the spot where it formerly stood; this they did besides the freewill offerings they brought with them from Babylon.