Romans 2:21; Romans 10:8; Romans 10:14-15

Romans 2:21

21 Thou therefore which teachest another, teachest thou not thyself? thou that preachest a man should not steal, dost thou steal?

Romans 10:8

8 But what saith it? The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach;

Romans 10:14-15

14 How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher?

15 And how shall they preach, except they be sent? as it is written, How beautiful are the feet of them that preach the gospel of peace, and bring glad tidings of good things!