If you disclose your charitable expenditures, they are good; but if you conceal them and give them to the poor, it is better for you, and He will remove from you some of your misdeeds [thereby]. And Allāh, of what you do, is [fully] Aware.
If you openly declare what you spend in charity, it is a good act. But if you keep it secret and give it to the poor in private, this is better as it indicates sincerity. Charity that is given sincerely becomes the means of sins being covered up and forgiven. Allah knows what you do and nothing from your circumstances is hidden from Him.