'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.

(Referencias: Arcana Coelestia 1284, Arcana Coelestia 1288)

In Genesis 10:5, Deuteronomy 28:49, this signifies a way of thinking. (Arcana Coelestia 1159)

In Psalms 35:28, 51:14, this corresponds in general to the affection for truth, or to people in the Grand Man in this affection, and are afterwards in affection for good from truth. (Arcana Coelestia 4791)

In Exodus 11:7, this signifies no condemnation or lamentation. (Arcana Coelestia 7784)

In Revelation 5:9, this signifies that those people have been redeemed who, in any religion, are in doctrinal truths. (Apocalypse Revealed 282)

(Referencias: Luke 16, 16:24, Luke 24; Revelation 10, 16, Revelation 16:10)