Vanity
'Vanity' signifies evil and the falsity of evil. 'Vanities of strangers' signify falsities of religion.
In Exodus 5:9, vain words signify truths when said by people who believe falsities. (Arcana Coelestia 7122)
(References: Apocalypse Explained 340)
Numbers 6:23-27
23
"Speak to Aaron and to his sons, saying, 'This is how you shall bless the children of Israel.' You shall tell them,
24
'Yahweh bless you, and keep you.
25
Yahweh make his face to shine on you, and be gracious to you.
26
Yahweh lift up his face toward you, and give you peace.'
27
"So they shall put my name on the children of Israel; and I will bless them."