Through Christ, what has been opened to the house of David?

Answer

"In that day there shall be a fountain opened to the house of David and to the inhabitants of Jerusalem for
sin and for uncleanness." Zech. 13: 1.

To whom does the \"seed\" in these promises refer?
What is the only unpardonable sin?
Upon what ground did Nicodemus rest his belief that Christ was a teacher from God?
Before coming to Sinai, what had Moses taught Israel?
How many will see Him when He comes?
What promise is made to those who look for Him?
Upon what conditions are we promised needed blessings?

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