swear. Hebrew "I lifted up mine hand". Figure of speech Metonymy (of Adjunct). App-6. Act put for the thing accompanying it: rightly rendered "swear". The Figure of speech Anthropopatheia is also involved in it.
Related Commentaries of Exodus 6:8
Exodus 6:8
8 And I will bring you in unto the land, concerning the which I did swearb to give it to Abraham, to Isaac, and to Jacob; and I will give it you for an heritage: I am the LORD.