BG 17.20–22
“Charity given as a matter of duty, to one who can do nothing in return, at the right place and time, is sattvic. Given grudgingly or for return, it is rajasic. Given to unworthy persons at the wrong time and place, it is tamasic.”
Why this matters for money: Krishna doesn't ask you to stop earning — He asks you to classify your giving and spending. Sattvic flow of wealth magnetizes more of it; tamasic outflow drains chart and bank together.