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.

What was contained in the second apartment?
While God is merciful, does this clear the guilty?
By what means did the Jews know God's will?
In connection with what historical event was the old covenant made?
After the law had been proclaimed from Sinai, what did the people again say?
Of what did Christ say the Son of man is Lord?
15. Because Solomon asked for wisdom rather than for long life and riches, what besides wisdom did God give him?

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