Romans 11:25; Romans 15:20

25 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 fulness of the Gentiles be come in .
20 Yea, so have I strived to preach the gospel , not where Christ was named , lest I should build upon another man's foundation: