These are the blessings you can expect from God when you give to the poor

You will be exalted with honor and the desire of the wicked about you will perish: Psalm 112:8-10
You will have joy, happiness: Proverbs 14:21
The LORD now owes you, He will pay you back: Proverbs 19:17
When you cry out to God, God will hear you: Proverbs 21:13
You will be blessed: Proverbs 22:9
You will not lack: Proverbs 28:27
God will bless you in all your work, and in all that you put your hand to: Deuteronomy 15:10-11