How perfect does Christ tell His followers to be?

Answer

"Be ye therefore perfect, even as your Father which is in heaven is perfect." Verse 48.

What record answers to this prophecy?
What is Christ's relation to this faith?
What is the strength of sin?
Did Christ's followers keep the Sabbath after His death?
What does the prophet Isaiah, speaking for God through this Spirit of Christ, call the seventhday Sabbath?
What are all admonished to do when these signs have appeared?
What does He say He will bring with Him when He comes?

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