Ezekiel 36:26

²⁶ I will also give you a new heart, and I will put a new spirit within you; and I will take away the stony heart out of your flesh, and I will give you a heart of flesh.

Lip

'A lip' in general signifies doctrine.

In Isaiah 6:3, 7, this signifies the interior parts of a person and thus internal worship where adoration is grounded.

In Isaiah 37:29, this signifies the thought of the understanding

In Malachi 2:6, 7, this denotes doctrine grounded in charity.