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They, that is, the angels, fear (yakhāfūna is a circumstantial qualifier referring to the person governing [the verb] yastakbirūna, 'they are [not] arrogant') their Rabb from above them (min fawqihim is a circumstantial qualifier referring to [the suffixed pronoun] -hum [of fawqihim]) in other words, [they fear their Rabb], being High above them with the power to subjugate, and they do what they are commanded, to [do].