Midrash su Geremia 17:27

R. Juda, the son of R. Samuel, in the name of Rab, said: "Conflagration is not frequent excepting only where violation of the Sabbath is found; for it is said (Jer. 17, 27.) But if ye will not hearken unto me to hallow the Sabbath day, and not to bear a burden, and to enter into the gates of Jerusalem on the Sabbath day, then will I kindle a fire in its gates, and it shall devour the palaces of Jerusalem and it shall not be quenched." What is meant by And it shall not he quenched? R. Nachman b. Isaac said: "It means 'At a time when men to quench it will not be accessible.' " Abaye said: "Jerusalem would not have been destroyed, but for the sin of violating the Sabbath, for it is said (Ez. 22, 26.) And from my Sabbaths do they turn away their eyes so that I am profaned among them." R. Abuhu said: "Jerusalem would not have been destroyed had it not been for the sin that they ceased to read the Sh'm'a every morning and evening, for it is said (Is. 5, 11.) Woe unto those that rise up early in the morning that they may run after strong drink, etc., And there are harp and psaltery timbrel and flute and wine and their drinking feasts, but the deeds of the Lord, they regard not. Therefore, are my people led into exile, for want of knowledge." R. Hamnuna said: "Jerusalem would not have been destroyed but for the sin that they ceased to teach small children, for it is said (Jer. 6, 11.) Pour it out over the child in the street. Why pour it out? Because the child is in the street [and not in school]."