30 Then he went to the second and said the same thing. And he answered, 'I go, sir,' but he did not go.
Matthew 21:30 Cross References - Common
Matthew 23:3
3 So you must observe and do whatever they tell you. But do not do what they do; for they preach, but do not practice.
Romans 2:17-25
17 But if you call yourself a Jew, and rely on the law and boast of your relation to God
18 and know his will and approve of what is excellent, because you are instructed in the law,
19 and if you are sure that you are a guide to the blind, a light to those who are in darkness,
20 an instructor of the foolish, a teacher of infants, having in the law the embodiment of knowledge and truth
21 you, then, who teach others, do you not teach yourself? You who preach against stealing, do you steal?
22 You who say that one must not commit adultery, do you commit adultery? You who abhor idols, do you rob temples?
23 You who boast in the law, do you dishonor God by breaking the law?
24 For, as it is written, "The name of God is blasphemed among the Gentiles because of you."
25 Circumcision indeed is of value if you obey the law; but if you break the law, your circumcision has become uncircumcision.
Titus 1:16
16 They profess to know God, but they deny him by their deeds; they are detestable and disobedient, unfit for any good deed.