Hebrews 12:24 says Jesus' sprinkled blood speaks a better word than whose blood?

Answer: Abel's

Believers have come to Jesus, mediator of a new covenant, and to the sprinkled blood that speaks a better word than Abel's.

“to Jesus the mediator of a new covenant, and to the sprinkled blood that speaks a better word than the blood of Abel.”— Hebrews 12:24 (BSB)