How early was this sacrificial system known?

Answer

"By faith Abel offered unto God a more excellent sacrifice than Cain, by which he obtained witness that he
was righteous, God testifying of his gifts." Heb. 11: 4. See Gen. 4: 3-5; 8: 20.

Through whom are repentance and forgiveness granted?
When did he say he saw the majesty of Christ, and heard the voice from heaven?
When brought before the king, what did Daniel say?
3. Before the giving of the law at Sinai, what did Moses say when Jethro asked him concerning his judging the people?
What is said of those embraced in the first resurrection?
7. What spirits stand ever ready to deceive and ruin those who are off guard or bent on going astray?
4. And when the new heavens and the new earth have appeared, and the holy city, New Jerusalem, then he made?

Questions & Answers are from the book Bible Readings for the Home Circle