God put it into my heart for registration by families

Nehemiah 7:4-73
Now the city was large and spacious, but there were few people in it,and the houses had not yet been rebuilt. So my God put it into my heart to assemble the nobles, the officials and the common people for registration by families. I found the genealogical record of those who had been the first to return. 
The whole company numbered 42,360, besides their 7,337 male and female slaves; and they also had 245 male and female singers.
Some of the heads of the families contributed to the work. The governor gave to the treasury 1,000 darics of gold, 50 bowls and 530 garments for priests. Some of the heads of the families gave to the treasury for the work 20,000 darics of gold and 2,200 minas of silver. The total given by the rest of the people was 20,000 darics of gold, 2,000 minas of silver and 67 garments for priests.
Nehemiah decides to create a register of all the families present, discovering as he does so an earlier list.
V 6-7 (almost identical to the list in Ezra 2, see notes) refer to the first , and main, party of Jews to return home in 538 following Cyrus' decree.
Why?
My God put it into my heart to.. is the mind from the Lord to register Jews. It is the records of the first return Jews from exile.
When we are follow the word of the Lord, sometime we have mind or idea could be from the Lord if it is not against to God's word. It should be not against the truth.
Some of the heads of the families and governor and some people contributed to the work of wall rebuilt. This is whole assemble come together for their home town and rebuilt the wall of Jerusalem.
God takes care each moment of mind and actions on his people.
How?
Nehemiah encouraged his people come together to built the wall of Jerusalem to protect their home town.