if you publish your freewill offerings it is excellent but if you conceal them and give them to the poor that is better for you and will acquit you of your evil deeds god is aware of the things you do.
إن تبدوا الصدقات فنعما هي وإن تخفوها وتؤتوها الفقراء فهو خير لكم ويكفر عنكم من سيئاتكم والله بما تعملون خبير