New Defender's Study Bible Notes
11:21 God spared not. Note that God “spared not the angels that sinned” (II Peter 2:4), He “spared not the old world” of the antediluvians (II Peter 2:5), and He “spared not the natural branches” (that is, Israel) when they rejected Him. This verse warns us that He will “also spare not thee” if we do the same. In contrast, however, He “spared not His own Son, but delivered Him up for us all” (Romans 8:32).
11:25 blindness in part. Israel has been judicially blinded (Romans 11:7-8) but only “in part.” Only “some of the branches be broken off” (Romans 11:17). Through every year in this age of the church, there has been “a remnant according to the election of grace” (Romans 11:5). Many Christian leaders, beginning with the apostles, have been Jews.
11:25 fulness of the Gentiles. God is now “[visiting] the Gentiles, to take out of them a people for His name” (Acts 15:14). When the full number (known only to God) has been reached, then “the times of the Gentiles” will end (Luke 21:24), and God will begin again to deal with Israel as His elect nation.
11:26 Israel shall be saved. The complete restoration of Israel will climax the purging trials of “the day of Jacob’s trouble” (Jeremiah 30:7). Paul refers here to Isaiah 59:20. This will take place when Christ returns to earth to establish His millennial kingdom centered in Jerusalem (Zechariah 12:8-10; 13:1; 14:9), following the great tribulation period (Matthew 24:29-31). The surviving and resurrected Jews will all acknowledge Jesus Christ as their Messiah and Savior in that day.