Exodus 30:11 says, And the LORD spake unto Moses, saying,  Then verse twelve states, When thou takest the sum of the children of Israel after their number, then shall they give every man a ransom for his soul unto the LORD, when thou numberest them; that there be no plague among them, when thou numberest them.  Matthew Henry says that this was likely not God continually speaking to Moses, but time passed for Moses to write down what God said before He continued.  Moses was to number the children of Israel by God's direction.  God was the government at that time.  It would be so much better today if God controlled the government in all aspects.  Verse thirteen adds, This they shall give, every one that passeth among them that are numbered, half a shekel after the shekel of the sanctuary: (a shekel is twenty gerahs:) an half shekel shall be the offering of the LORD.  The people were to give a gift of a half shekel for the upkeep of the tabernacle and a half shekel as an offering to the LORD.  God's people were expected to support His work, just as we are today.  God expects us as followers of Christ to bring our tithes and offerings to Him.  Verse fourteen says, Every one that passeth among them that are numbered, from twenty years old and above, shall give an offering unto the LORD.  Everyone twenty and older was to give an offering to God.  Verse fifteen adds, The rich shall not give more, and the poor shall not give less than half a shekel, when they give an offering unto the LORD, to make an atonement for your souls.  The rich and the poor were required to give the same amount.  Again this was to support God's work and was not to support a secular government.  Moses was told that this was to be given to make atonement for their souls.  I believe this would have been to show their obedience, and not to buy redemption.  We today show our obedience to God by accepting the sacrifice of Christ on the cross for our redemption, then we are expected to support His work in the world.  We do not buy redemption with our gifts to God, our tithes and offerings, but we show our faith in Him whn we give.  Verse sixteen states, And thou shalt take the atonement money of the children of Israel, and shalt appoint it for the service of the tabernacle of the congregation; that it may be a memorial unto the children of Israel before the LORD, to make an atonement for your souls.  The atonement money was to be used for the upkeep of the tabernacle, just as our tithes and offerings today are to be used in the continuation of God's work.  Verse eighteen declares, And the LORD spake unto Moses, saying,  Then verse eighteen adds, Thou shalt also make a laver of brass, and his foot also of brass, to wash withal: and thou shalt put it between the tabernacle of the congregation and the altar, and thou shalt put water therein.  There was to be a basin filed with water between the people and the tabernacle.  Verse nineteen continues, For Aaron and his sons shall wash their hands and their feet thereat:  Aaron and his sons were to wash their hands and feet in the basin, which would represent a spiritual cleansing,  We today should do all that we can to be spiritually clean when we come before God.  Verse twenty states, When they go into the tabernacle of the congregation, they shall wash with water, that they die not; or when they come near to the altar to minister, to burn offering made by fire unto the LORD:  Aaron and his sons were to do this washing anytime they went into the tabernacle so that they didn't die.  We are purified by the blood of Christ so that we don't suffer spiritual death, but we are still to do all in our power to follow God's laws so that we can show our commitment to Him.  Verse twenty-one concludes, So they shall wash their hands and their feet, that they die not: and it shall be a statute for ever to them, even to him and to his seed throughout their generations.  This law was to apply not only to Aaron and his sons, but to future generations as well.  Christ's death on the cross was not just for that generation, but for all people for all time.  We simply have to believe that He died for our sins and put our faith in His gift of salvation.