The object or action that assures desired results.
In planting, house building, at weddings, etc. certain things are done or given to ensure a good crop, a safe and prosperous occupancy of the house, or a good relationship. It is practiced as a form of sympathetic magic.
A sulig fish is placed in the house when one first moves in, that is to say that is the thing that ensures that one’s income will constantly increase.
When you give your tithes that is what ensures (what you make sure with) that your wealth will increase.