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.

For what spiritual gift did the Apostle Paul pray?
What answer did he return when asked concerning his mission?
Besides the court, how many parts had this sanctuary?
2. What did God tell Adam and Eve would he the result if they transgressed, and partook of the forbidden fruit?
What will God's faithful servants be doing at this time?
Referring to Peter's coming sore trial, for what did Christ say He had prayed?
When praying what must we do in order to be forgiven?

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