Jeremiah 4:3-4

3For thus says the Lord to the men of Judah and Jerusalem:

aBreak up your fallow ground,
and bsow not among thorns.
4 cCircumcise yourselves to the Lord;
remove the foreskin of your hearts,
O men of Judah and inhabitants of Jerusalem;
dlest my wrath go forth like fire,
and burn with none to quench it,
ebecause of the evil of your deeds.”

Ezekiel 18:31

31 fCast away from you all the transgressions that you have committed, and gmake yourselves a new heart and a new spirit! hWhy will you die, O house of Israel?

Matthew 15:8

8 i“‘This people honors me with their lips,
but their heart is far from me;

John 4:24

24God is spirit, and those who worship him must worship in spirit and truth.”
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