Brewer's: Soul Cakes
Cakes given in Staffordshire and Cheshire on All Souls' Day, to the poor who go a-souling, i.e. begging for soul-cakes. The words used are -
Soul, soul, for soul-cake Pray you, good mistress, a soul cake.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894