Do not prevent him who is able from doing good. When you are able, do good yourself too
Other versions
King James Version
Withhold not good from them to whom it is due, when it is in the power of thine hand to do it. English Standard Version
Do not withhold good from those to whom it is due, when it is in your power to do it.New International Version
Do not withhold good from those who deserve it, when it is in your power to act.