What was the reason for Cain's jealousy towards Abel?

Cain's jealousy towards Abel stems from the fact that God favored Abel's offering of lambs over Cain's offering, which consisted of fruits and vegetables. This favoritism ignited Cain's feelings of resentment and jealousy. In the biblical account, God ultimately accepted Abel's sacrifice because it was from the best of his flock, while He rejected Cain's offering. This dynamic highlights themes of favoritism and the emotional turmoil that can arise from perceived inequality among siblings. Cain's reaction to God's preference for Abel further illustrates the destructive nature of jealousy, leading him to commit the grave act of murder against his brother.