E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Between Bels two fires. Scylla on one side and Charybdis on the other. In Irish, Itter dha teine Bheil, in a dilemma. The reference is to the two fires kindled on May Eve in every village, between which all men and beasts devoted to sacrifice were compelled to pass.