Give, and it shall be given unto you; good measure, pressed down, and shaken together, and running over, shall men give into your bosom. For with the same measure that ye mete withal it shall be measured to you again Luke 6:38.
Whatsoever you have received today is a product of what you gave out yesterday. God cannot help you if you are not a giver. Fasting and prayers cannot make you prosperous. If you keep the law and live a holy life but do not give to others, you will be a holy poor man Even God, after He lost man, had to give His son in order gain man back. To gain man back, God had to give man; the word became flesh so that heaven will have a man to give.
As the partridge sitteth on eggs, and hatcheth them not; so he that getteth riches, and not by right, shall leave them in the midst of his days, and at his end shall be a fool Jer. 17:11. If your prosperity is not based on the foundation of giving, you will soon lose it. In the kingdom, true prosperity comes only by living a life of giving to others. No wonder the true saying, “givers never lack”. The law of giving to receive works for both believers and unbelievers. The divine principle for having more is to give what you have. Until you give, the right climate that attracts prosperity will not be seen around you.
There are four kinds of giving that determines 4 levels of life
1. The giving you do to keep you where you are giving to the poor and those below your status. This does not make you rich, but ensures you do not fall to the level of the person you are giving to. You will never fall to that level if you give to people in that level.
2. Giving to those on the same level with you to sustain your status. You give to an equal      to stabilize him so that you will not experience the kind of problem he is experiencing.
3. Giving to your Melchizedek giving to those higher than you. When you give to a man      that is higher than you, the anointing that took him there will rest upon you. And      without all contradiction, the less is blessed by the better Hebrew 7:7.
4   Giving to God. This is further classified into four kinds of giving to God:
I    Tithes and Offerings
II    Seed sowing to establish what you are believing God for
III. Vows to provoke God into action
IV. Thanksgiving offering

Giving your tithes and offerings to God consistently is a way at snowing to.
God that you are responsible and that He can trust you with wealth. Once you are consistent in your tithes and offerings, you have placed yourself on the right path to prosperity; nothing will be able to hinder your prosperity. Making vows and sowing seeds is also a very effective means of attracting prosperity from heaven. When you sow a seed towards a particular area of need, it activates the relevant anointing that bruises the head of Satan (authority of the devil or enemy) in that very area. The bible says in Gen. 3:15-the seed of the woman shall bruise the head of Satan. Sowing of seeds in the house of God therefore frustrates the claims o the enemy in that area of need and breaks the covenant right the enemy lays claim to in that area. (Also see Psalm 126, Isaiah 54:3b).
Jonah gave a thanksgiving offering in the belly of the fish  by praising God and God commanded the fish  to vomit him, Jonah 2:9-10. In 1 Kings 3:3- 4, we see how God bless Solomon when he brought before Him a thanksgiving offering. As Solomon sacrificed to God in thanksgiving, God gave him a blank cheque. This proves the fact that thanksgiving qualifies you for another receiving for God even blessed Solomon beyond his request.
Living a holy life does not guarantee prosperity, the only criteria for receiving is giving, this is a divine principle and it works for both Christians and unbelievers alike. It takes giving to prosper, not prayer and fasting, thus if you want to prosper, you must become a giver. The devil can only attack your prosperity if you do not build a solid foundation in this aspect of your life. Those that keep holding back will not ha substance, but those that give out freely will have more than enough. See what the bible says in Proverbs 11:24-26:
There is that scattereth, and yet increaseth; and there is that withholdeth more than is meet, but it tendeth to poverty The liberal soul shall be made fat: and he that watereth shall be watered also himself He that withholdeth corn, the people shall curse him: but blessing shall be upon the head of him that selleth it.
Like the saying goes, Givers never lack”. If you are currently experiencing lack in your life, rather than blame the devil for it, examine your life to see if you have been faithful in giving to God and to men.