In the Monasticon de Melsa, ii. pp. 134, 137, we read that a Jew at Tewkesbury fell into a cesspool, and Richard, Earl of Gloucester, passing by, offered to pull him out, but the Jew refused, saying
Sabbato nostra colo; De stercore surgére nolo.
Next day, as the Earl was passing again, the Jew cried to him for help, when Gloucester replied -
Sabbata nostra quidem, Solomon, celebrabis ibidem.
The Rolls Series.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894