@Patrizia Tenerelli asked about a mantra for generosity in todays session. Although I couldn't find a specific Sanskrit mantra for generosity (at least from an authentic source), I thought I would post this mantra practice from the book Healing Mantras by Thomas Ashley Ferrand.
It's a mantra practice that allows you to work with various inner conditions. He explains that it's about offering up the negative quality and invoking the quality of peace. As people mentioned, including me, about various emotions coming during the generosity practice this practice might be suited.