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 what instrumentality is conversion wrought?
When believers are baptized into Christ, whom do they put on?
To another whose sight He had restored, what did Christ say?
In consequence of this, what value did Christ place upon their worship?
What is said of those who love God's law?
When the church had received help from the state to this extent, what more did she demand?
What does He say He will bring with Him when He comes?

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