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?
By what comparison is it shown that the heavenly sanctuary will he cleansed?
What is first commanded in the Sabbath commandment?
What will Christ do with the saints when He comes?
How many does Paul say will suffer persecution?
When asked if He was a king, what did Christ say?
Who has everlasting life?

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