Beyond the temple and the omen tablet, Adad had a distinct and very practical career in the ancient Near East: as the god most reliably invoked to punish those who broke a sworn agreement. Near Eastern treaties and loyalty oaths, from the earlier second millennium through the Neo-Assyrian and Aramaic periods, regularly close with a list of curses meant to fall on whichever party violated its terms, and Adad, in his western guise as Hadad, appears again and again in this closing list as the god called upon to withhold rain, send devastating floods, or blight the fields and flocks of the oath breaker, a punishment drawn directly from his ordinary storm-and-flood portfolio rather than any specialised legal role. The eighth century BCE Aramaic treaty inscribed on the Sefire stelae, an agreement between two Syrian rulers, invokes Hadad by name among the deities called to enforce the pact with exactly this kind of devastation, and the loyalty oaths imposed by the Neo-Assyrian king Esarhaddon on subject rulers in the following century include comparable storm-god curses among a long roster of divine enforcers.
This treaty role sat naturally alongside Adad's older association with divination through the baru priesthood, since a god already read for omens of the future was a plausible enforcer of oaths sworn about the future, and it shows how thoroughly a storm god's basic, weather-based power was formalised into the legal and diplomatic vocabulary of the ancient Near East. Long after any individual treaty had lapsed, the formula calling on Hadad to punish broken oaths kept being copied into new agreements across different kingdoms and languages, a legal convention as durable, in its way, as the storm god's cult itself.