Most people do not know why God blesses Israel so much. It’s because giving is imbedded in their culture (habits, attitude, beliefs and customs).
In Exodus 23:14 when God says, “Do not appear before me empty-handed”, this is seen as a law to most of the Jews. Tithe was the foundation of all the festivals (Passover, the feast of the ingathering and the feast of harvest - first fruits).