Acts 21:24
Take these men and observe the ceremony of purification with them, pay their expenses so they can shave their heads [i.e., to signify that they are making a vow] and [then] everyone will know that there is no truth in what people have been told about you, but that you, too, are living properly and observing the law of Moses.
Romans 11:7-10
What then? [Just this]: The very thing that the Israelites are looking for [i.e., a right relationship with God], they have not found. But God's selected ones obtained [this right relationship with Him] and the rest [of the Israelites] were made insensitive to God's call,
Romans 11:25
For I want you to know this secret, brothers, so you will not become conceited: Part of the Israelites have become [spiritually] insensitive [to God], [and will remain that way] until the fullness of the Gentiles occurs. [Note: As with verse 12, concerning the Jews, "fullness" here may mean either a large or the complete number of Gentiles who will be saved].
2 Corinthians 4:3-4
For even if our Gospel message is veiled, it is veiled [only] from those who are lost.