Ezra 3:1

Ezra 3:1 says, And when the seventh month was come, and the children of Israel were in the cities, the people gathered themselves together as one man to Jerusalem.  The people of Israel had returned to their cities, which as Matthew Henry points out were pretty much in ruins.  They had a lot of work to do and could have put that above serving and worshipping God, as many people do today.  Still, without anyone summoning them, the gathered in Jerusalem as one man.  It was unusual, but they were unified in preparing to serve and worship God instead of grumbling and complaining.  We as Christians need to be unified in doing God's work and worshipping Him without grumbling and complaining.  

Verse two adds, Then stood up Jeshua the son of Jozadak, and his brethren the priests, and Zerubbabel the son of Shealtiel, and his brethren, and builded the altar of the God of Israel, to offer burnt offerings thereon, as it is written in the law of Moses the man of God.   Jeshua, the high priest and the other priests built an altar to God to offer burnt sacrifices on.  They may not have had a Temple or even a tabernacle but that didn't stop them from worshipping God. We may not have a building in which to worship God, but we can easily have an altar, a place dedicated to God.  

Verse three continues, And they set the altar upon his bases; for fear was upon them because of the people of those countries: and they offered burnt offerings thereon unto the Lord, even burnt offerings morning and evening.   Even though we are told that they feared the people around them, they offered burnt offerings to God in the morning and in the evening.  We should never allow fear of the people of the world to stop us from worshipping God and we should worship Him all day long in everything we do.  

Verse four states, They kept also the feast of tabernacles, as it is written, and offered the daily burnt offerings by number, according to the custom, as the duty of every day required;  They observed the Feast of Tabernacles as God's word said it should be observed.  We need to make sure that our worship services are in accordance with God's word.  

Verse five adds, And afterward offered the continual burnt offering, both of the new moons, and of all the set feasts of the Lord that were consecrated, and of every one that willingly offered a freewill offering unto the Lord.  They kept a continual burnt offering going and observed all the feasts that God's word called for, and they willingly offered free will offerings to God.  We today as Christians are not forced to offer anything to God, but we should willingly give to support the church.  If we understand that everything that God blesses us with is already His, then we should have no problem in giving back to Him since He has blessed us with everything.  

Verse six continues, From the first day of the seventh month began they to offer burnt offerings unto the Lord. But the foundation of the Temple of the Lord was not yet laid.  They were giving and offering burnt offerings to God, but the foundation of the Temple of the Lord was not yet laid.  We do not need to worry about church buildings in order to worship God.  All we have to do is accept Jesus Christ as our personal Savior and Lord and then be led by the Holy Spirit.