Ezekiel 3:10

¹⁰ And He saith unto me, `Son of man, all My words, that I speak unto thee, receive with thy heart, and with thine ears hear;

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.

⁷ If you remain in me, and my words remain in you, you will ask whatever you desire, and it will be done for you.