But this I say, He which soweth sparingly shall reap also sparingly; and he which soweth bountifully shall reap also bountifully. 2 Corinthians 9:6 KJV https://bible.com/verse-of-the-day/2co.9.6/77051

God rewards each person for whatever they offer to Him but only to those who give with a cheerful attitude. If you are a grumpy giver then your attitude will keep you from receiving a reward from Him, so be a cheerful giver of your time and your talents as well as your money.