Chapter 17 · verse 20 · gita.yoga.org

Bhagavad Gita 17.20

दातव्यमिति यद्दानं दीयतेऽनुपकारिणे।देशे काले च पात्रे च तद्दानं सात्त्विकं स्मृतम्

That gift which is given to one who does nothing in return, knowing it to be a duty to give in a suitable place and time to a worthy person, is held to be Sattvic.