"For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel until the fullness of the Gentiles be come in. And so all Israel shall be saved: as it is written, There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob: For this is my covenant unto them, when I shall take away their sins." - Romans 11:25-27 (Audio)
Here are some sermons on these verses:Great Events Preceding Christ's Return - The Conversion of the Jews, by Rev. Keven McCleod
The Restoration and Conversion of the Jews, by Pastor Charles Haddon Spurgeon (1834-1892)
Israel - The Restoration, by Dr. David P. Murray