We will not neglect the house of our God.
These nine words solemnize a reaffirmation of the covenant, focusing on the worship of God in His temple at Jerusalem. The leaders of the returned exiles who had worked so hard under Ezra to build another temple, and who had endured opposition and enormous commitment under Nehemiah to restore the walls of Jerusalem, now turn to the final step of commitment by restoring all the temple worship necessities. They commit to giving themselves first to the Lord, and giving to God what God had given to them in order to support the priests, Levites, and others working in worship in the temple complex.
Their covenant at this time is a reminder for us to consider making commitments to guard against the inevitable drift in dedication that our souls can experience. When the work is hard and still undone, it is easy to stay committed. After all, the task is unfinished and the need to stay at it with dedication is clearly visible and apparent to everyone involved. It is after completion, once the newness of a thing wears off, that we are in danger of severe vision drift. And this led the Jews to recommit the priests, Levites, and temple leaders to God's Law first (Nehemiah 10:28-31).
This commitment then meant that the rest of the Jews who had returned to Judah would also obligate themselves to support the worship of God in Jerusalem. The rest of this covenant reaffirmation then expresses their willingness to give tithes, offerings, food, oil, wood, and all other necessities for the maintenance of the worship needs of the temple (Nehemiah 10:32-39). They will give out of worship and to the worship of the Lord.
Everybody made a commitment... the leaders to lead the worship by God's Law and the people to worship and support this in keeping with God's Law. And it was this "all in" total effort that led to this bold declaration: "We will not neglect the house of our God." Great ministry and great worship involves everyone so that God gains glory from all His creation.