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.

How does David express this same truth?
With what, therefore, is the faith of Jesus joined?
What is revealed by the law?
What did the wise men of the East do when they had found Jesus?
19. Upon returning from a feast at Jerusalem how came Joseph and Mary to lose Jesus when He was twelve years old?
For how long a time should one honor his parents?
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