Bhagavad Gita, Chapter 17, Verse 21

And what is given with a view to receiving in return, or looking for the fruit, or again reluctantly, that gift is held to be Râjasika.

The same act of giving is shown here turning real and reluctant once expectation gets attached to it.

Krishna names hesitation and hope of reward as what actually shifts charity into this lower mode. Real generosity and transactional giving are shown as genuinely different things.