Antediluvians: Worship God
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Genesis 4:3, 4, 26
So in the course of time, Cain brought some of the fruit of the soil as an offering to the LORD, / while Abel brought the best portions of the firstborn of his flock. And the LORD looked with favor on Abel and his offering, / And to Seth also a son was born, and he called him Enosh. At that time men began to call upon the name of the LORD.