What does the Bible say about Cain and Abel's offerings?

In the account of Cain and Abel in Genesis 4, Cain brought an offering of the fruits of the ground, while Abel offered the firstlings of his flock. God respected Abel's offering because it was in accordance with His command, demonstrating faith and obedience. In Hebrews 11:4, it is said that Abel's offering was more excellent than Cain's; this is a testament to Abel's faith. Cain's offering was rejected because it was not commanded by God, lacked the required blood sacrifice, and stemmed from a heart that did not truly seek to honor the Lord. Cain's religious practices exemplified a reliance on his own works, which ultimately led to his anger and rejection by God.