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.

Through whom is the reconciliation received?
11. What sign did Christ mention by which His disciples might know when the destruction of Jerusalem was near?
Is Christ coming again?
In what words will their triumph over death and the grave be expressed?
Out of what will they be judged?
What has He promised to be to those in trouble?
Does Jesus sympathize with us in our afflictions?

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