KohR[1]13:2(11) :מתלא אמ׳ לא מיסתיא מובד דידיה אלא דחורנין מוביד‏ : the proverb says: it is not enough that he loses his own but he loses that of others
See the entire entry for messā, messəṯā n.f. measure, as much as, enough for