Of what was Abraham's obedience the fruit?

Answer

"By faith Abraham, when he was called, obeyed to go out unto a place which he was to receive for an
inheritance; and he went out, not knowing whither he went." Heb. 11: 8, R.V.

In what words was this promise renewed to Abraham?
What encouragement is held out as an aid in attaining this experience?
Will the Sabbath be observed as a day of worship in the new earth?
Has the exact time of Christ's coming been revealed?
How does Isaiah speak of the wicked at this time?
What were the names of these seven churches?
Why was this to be?

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