E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Promise of Odin (The).
The most binding of all promises to a Scandinavian. In making this promise the person passed his hand through a massive silver ring kept for the purpose; or through a sacrificial stone, like that called the Circle of Stennis.
I will bind myself to you by the promise of Odin, the most sacred of our northern rites.Sir W. Scott: The Pirate, chap. xxii.