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 loss do those sustain who do not accept Him?
What deliverance was thus made possible?
What is promised those who honor their father and their mother?
What will occur when the Lord descends from heaven?
What marked the climax of Babylon's apostasy?
To what length will this effort to enforce the worship of the image of the beast be carried?
7. Seeing, then, that the Sabbath is holy, is to be kept holy, and is a day for holy convocations, what must be its character?

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