Abel was the second son of Adam and Eve, born after his brother Cain. He was a shepherd, while Cain was a farmer. Both brothers brought offerings to God, but God accepted Abel's offering and rejected Cain's. This led to Cain's jealousy and anger, and he killed Abel in a field.
God confronted Cain about Abel's murder, and as a result, Cain was cursed to be a wanderer on the earth. The New Testament references Abel as an example of faith (Hebrews 11:4) and as a righteous man whose blood cried out for justice (Matthew 23:35; Luke 11:51). Abel's blood is also contrasted with the blood of Jesus, which speaks of better things (Hebrews 12:24). After Abel's death, Adam and Eve had another son named Seth.
Article: STEPBible, Tyndale House Cambridge · CC BY 4.0