Malachi chapter 3

   1 Behold, I will send my messenger, and he shall prepare the way before me: and the LORD, whom ye seek, shall suddenly come to his temple, even the messenger of the covenant, whom ye delight in: behold, he shall come, saith the LORD of hosts.

   2 But who may abide the day of his coming? and who shall stand when he appeareth? for he is like a refiner's fire, and like fullers' soap:

   3 And he shall sit as a refiner and purifier of silver: and he shall purify the sons of Levi, and purge them as gold and silver, that they may offer unto the LORD an offering in righteousness.

   4 Then shall the offering of Judah and Jerusalem be pleasant unto the LORD, as in the days of old, and as in former years.

   5 And I will come near to you to judgment; and I will be a swift witness against the sorcerers, and against the adulterers, and against false swearers, and against those that oppress the hireling in his wages, the widow, and the fatherless, and that turn aside the stranger from his right, and fear not me, saith the LORD of hosts.

   6 For I am the LORD, I change not; therefore ye sons of Jacob are not consumed.

   7 Even from the days of your fathers ye are gone away from mine ordinances, and have not kept them. Return unto me, and I will return unto you, saith the LORD of hosts. But ye said, Wherein shall we return?

   8 Will a man rob God? Yet ye have robbed me. But ye say, Wherein have we robbed thee? In tithes and offerings.

   9 Ye are cursed with a curse: for ye have robbed me, even this whole nation.

 10 Bring ye all the tithes into the storehouse, that there may be meat in mine house,
    and prove me now herewith, saith the LORD of hosts,
    if I will not open you the windows of heaven, and pour you out a blessing,
    that there shall not be room enough to receive it.

 11 And I will rebuke the devourer for your sakes, and he shall not destroy the fruits of your ground; neither shall your vine cast her fruit before the time in the field, saith the LORD of hosts.

 12 And all nations shall call you blessed: for ye shall be a delightsome land, saith the LORD of hosts.

Text was found at: The Bible Gateway

Although this scripture does not correspond perhaps to the numbering in the new Orthodox Study Bible the intent of the words are the same. For me, nektarios ippotis (charlie knight), I have great financial needs and very few resources to draw on in this world.
I guess that is a blessing.  I now must depend on God, as I should have from the beginning.
For me, the first 9 verses of this book tell a little background, and I see myself in those verses,
       and breath a prayer of forgiveness to God.
BUT verse ten gives me a basic minimum to do and a PROMISE from GOD that if I do this basic minimum
HE WILL BLESS me, abundantly.
What does God ask me to do.
   1) To put aside the first 10 percent of what I get (that is the tithe)
   2) To bring that tithe to God.  
       I think I should do it when I get it, the first time I come to Worship God after I get a valuable good.
   3)  Go about my way having done what I was asked to do and thinking of it no more.
        (That is my take on this from other scriptures)
         BUT God says "prove me" so I suppose you could say "God, OK, I did my part,
                 now the ball's in your court, prove this to me!"
What does God say He will do (If I tithe or give more)
   a)  God will "Open the Windows of Heaven"  
         (this gift from God will come from a place I might not expect, it comes FROM GOD)
   b)  God will "Pour ...out a blessing", and you say that is nice, a blessing.  But God does not mean just words here, 
         He means a tangible proof that you are blessed.  That means so all will recognize God has blessed you.
          I take that to mean that my needs will be met when perhaps it seemed like they could not be met at all.
   c)   God will pour out such a blessing that "there shall not be room enough to receive it".  
         That means to me that God will bless me in such a way that when all my containers are full
         I will still have much to give to others, what JOY!

So now you have my take on what God will do if I do the very basic least
     of giving back to Him one tenth of what I receive.

It is true that the early church gave out of a "free will offering" basis out of the thankfulness of their heart for the great gift of Salvation that came to them through the sacrifice of Christ.  But today a "free will offering" is transplanted by many to mean you can give as little as your like.

I suppose the old man I overheard talking one day is right.  I think I remember hims telling someone "Ah suppose if ya give God the leftovers, they you shouldn't expect nuthin but leftovers coming back to yah".  I am so ashamed that my own creature comforts have come before my gifts to God, and as a consequence I have often been hungry, without money to pay of lodging,  clothing, or anything else.

I am not telling you that you have to do as I have made a commitment to do.  What I am saying is that I, nektarios ippotis (charlie knight) have made the decision to take God at his word,
     and expect the Blessings He knows will be "good for me".
I know the evilness of my heart, so I have held on tight to the principle of tithing.  I can understand what 1/10th of something is.     I can calculate how much that is.  So that is what I will give.
SOoooooo   You say maybe you are not "ready" for that yet.  But I want to show you how GOOD GOD IS.
Therefore I intend to try and keep a record of everything I spend and everything I receive, so you can come back here often and see what God is doing in my life as he PROVES that HIS WORDS are TRUE.     Blessings be showered upon you as you seek God's Will.

PS
It is entirely possible that the greatest BLESSING you might NEED is to find out how to live trusting GOD during abject poverty.
I am not saying give one tenth of your income and get rich quick.
I am saying that God has PROMISED that if we give 1/10 of what He sees to it that comes our way, from work, or a bonus check, or a gift from someone, or whatever means (in the end it all comes from God anyway); if we give then HE WILL pour out a blessing (something we need which might be money, or clothes, or transportation or food or love or respect or any number of things) that will be so large that we can not contain it.    After you have watched and seen what God is doing in my life, then try it yourself, so I am not the only one following this principle and being  BLESSED !!!