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.

In connection with Christian baptism, what is washed away?
What does the prophet Jeremiah declare Christ to be?
Why should wives he in subjection to their husbands?
What did this power do to the truth?
Into what perplexity did Christ's working of miracles on the Sabbath throw the Pharisees?
When Christ sent out the seventy, what did He tell them to do in the cities whither they went?
When expiring on the cross, what did Christ say?

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