Generosity dream meaning is explained below using 2 different sources. Each interpretation is shown with its source.

Interpretation 1 — Ibn Seerin

(Horse, Kindness) Generosity or openhandedness in a dream means acknowledgment of God’s favors and expressing one’s gratitude for them. Generosity in a dream also could represent the return to noble thinking, proper moral conduct, good character and finding guidance after heedlessness.
Source: Islamic Dream Interpretation Author: Ibn Seerin

Interpretation 2 — Stearn Robinson - Tom Corbett

You are assured of more than a fair share of material wealth if you dreamed of being generous in either thought or deed.
Source: The Complete Guide to Interpreting Your Dreams Author: Stearn Robinson - Tom Corbett