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.

Did Joshua think it immaterial what god Israel served?
For what purpose were these gifts bestowed upon the church?
17. What assurance was given by the angel that these prophecies would he understood in the last days?
What, in prophecy, is symbolized by waters?
What proposition did He submit to them?
Who made the Sabbath?
What did Christ say was to be the next great event following these signs?

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