
We are told that Cain and Abel both presented God with a sacrifice. Abel provided the very best of what he had, “the first of the flock.” He gave God right worship.
Cain presented God with an unacceptable offering of the “fruit of the ground.” It seems Cain picked the unsatisfactory fruit off the ground and offered that to God instead of picking the very best from the tree. God sees Cain’s offering is not good and warns him to do better. Cain rejects this fatherly correction and instead blames God for favoring Abel. We know his anger got the best of him and he committed murder.
The story of Cain and Abel reminds us that worship is to involve the very best, the first of our flock. In our daily life, that includes our attentiveness in prayer and Mass; making time for prayer in the day; prioritizing our tithing; and even doing the best at our daily tasks as we offer them to God.
From the Catechism
2135 “You shall worship the Lord your God” (Mt 4:10). Adoring God, praying to him, offering him the worship that belongs to him, fulfilling the promises and vows made to him are acts of the virtue of religion which fall under obedience to the first commandment.

