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.

From what time has the devil been a murderer?
What is said of the poor but wise child?
How is the church of the last days described?
What power is there in the blood of this covenant?
Does He afflict to leave the one chastened in despair?
Upon what condition does Christ say we shall receive?
By what have these things been revealed to us?

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