The little bell rung to give notice that the “Host” is approaching. Now called sanctus bell, from the words “Sanctus, sanctus, sanctus, dominus, Dcus Sabaoth,” pronounced by the priest. (French, sacrer; Latin, sacer.)
“He heard a little sacring bell ring to the elevation of a to-morrow
“The sacring of the kings of France.” —Temple.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894