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According to most of the commentators, especially Ibn 'Abbas (as quoted by Tabari and others), the term rawh is here synonymous with rahmah ("grace" or "mercy"). Since it is linguistically related to the noun ruh ("breath of life" or "spirit"), and has also the metonymic significance of "rest" (rahah) from grief and sadness (Taj al-'Arus), the most appropriate rendering would seem to be "life-giving mercy".
The word is rauh, not ruh as some translators have mistakenly construed it. Rauh includes the idea of a Mercy that stills or calms our distracted state, and is particularly appropriate here in the mouth of Jacob.
Jacob ignores and forgives the sting and malice in the speech of his sons, and like a true Prophet of Allah, still wishes them well, gives them sound advice, and sends them on an errand which is to open their eyes to the wonderful ways of Providence as much as it will bring consolation to his own distressed soul. He asks them to go again in search of Joseph and Benjamin. Perhaps by now he had an idea that they might be together in Egypt. In any case their stock of grain is again low, and they must seek its replenishment in Egypt.