Arcana Coelestia #3046
3046. 'And swore to him concerning this matter' means a very solemn undertaking. This is clear from the meaning of 'swearing' as a bond, and indeed a most sacred bond since he swore by 'Jehovah, the God of heaven and the God of the earth', as dealt with in 3023. It is accordingly a very solemn undertaking, for a very solemn undertaking is nothing else than a bond.
Servant of servants
'A servant of servants,' as in Genesis 9:25, signifies worship in externals without charity, or the most vile things in the church.
(Referencat: Arcana Coelestia 1091)