God is addressing the priests, specifically Aaron and his descendants, who are responsible for the spiritual leadership and service in the temple. The offerings mentioned—olive oil, new wine, and grain—are significant as they represent the firstfruits, the initial and best portion of the harvest. This act of giving the firstfruits to the priests is a way of acknowledging God's provision and blessing. It also serves as a practical means of supporting the priests, who do not have an inheritance of land like the other tribes of Israel. By receiving these offerings, the priests are sustained and can continue their sacred duties without the need to cultivate land themselves.
This arrangement highlights the communal responsibility of supporting spiritual leaders and the importance of prioritizing God in one's life. The firstfruits symbolize trust in God's continued provision and a heart of gratitude. This principle encourages believers to give generously and prioritize their relationship with God, recognizing His role as the ultimate provider of all resources and blessings.