עשר תאשר -Tithe and You Shall Become Rich Hashem says you can test Him on this one

With this aspect of money Hashem goads us into it we want to give Tzedaka and become rich, that if we give our yearly ten percent or more then we are promised that we will become rich at least to the 90/10 rule and more if the intentions are pure (and also if not) because Hashem is The True Judge and He will decide what we need to do here and into the future. He promises that no bad will ever arise from giving Tzedaka so if you see someone who needs funds or if they ask you for funds and you have the cash you are even able to give a one-time amount freely of up to one fifth of all your wealth to this person. It's a wonderful thing to be able to utilize one's monies for good and if you keep up the good work you'll notice that Hashem is always by your side and He also does promise that you will reach all your spiritual goals as well! On this planet and during your lifetime! So like next time someone needs your help trust that Hashem is actually giving to you an opportunity to give His money back to Him through the conduit of the needy person. Aye.

Kfir.