Yehezkiel 36:26

36:26 I will give you a new heart, and I will put a new spirit within you. I will remove the heart of stone ¹  from your body and give you a heart of flesh. ² 

[36:26]  ¹ sn That is, a heart which symbolizes a will that is stubborn and unresponsive (see 1 Sam 25:37). In Rabbinic literature a “stone” was associated with an evil inclination (b. Sukkah 52a).

[36:26]  ² sn That is, a heart which symbolizes a will that is responsive and obedient to God.