Why did King David curse?

Question: Good evening! I am concerned about a question that I have not been able to find a clear answer at all. Looking over Psalm 109, I met one of the Psalms...
Vasile Filat

Doctrine

About tithing from donations

The next question relates to the practice of tithing: I would like to know if it is necessary to give the tithe from aid received (donations or a small parcel)?...
Vasile Filat