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 home did God make for man in the beginning?
22. After being united with Christ in the likeness of His death and resurrection, what should the believer do?
How many were saved in the ark?
Whose voice had more weight with Saul than had the commandment of God?
Which are some of the most touching and soul-winning of Christ's parables?
Because of disobedience, what experience came to Israel ?
How many resurrections are there to be?

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