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Cf. 21:79 and the corresponding note [73].
Lit., "for him". The term hadid denotes, primarily, something that is "sharp" in both the concrete and abstract senses of the word: for the latter sense, cf. the Qur'anic phrase "sharp (hadid) is thy sight today" ( 50:22 ), or the many idiomatic expressions like rajul hadid, "a man of sharp intellect", hadid an-nazar, "one who looks boldly [at others]", ra' ihah hadidah, "a sharp odour", etc. (Lisan al-'Arab). As a noun with a definite article (al-hadid), it signifies "all that is sharp", or "sharpness", as well as "iron". God's having "softened all sharpness" in David is evidently an allusion to his exalted sense of beauty (expressed in the poetry of his Psalms) as well as to his goodness and humility. - An alternative rendering of the above phrase would be: "We caused iron to become soft for him", which might be an allusion to his outstanding abilities as poet, warrior and ruler.
Lit., "did We bestow upon David a favour from Ourselves". This connects with the elliptic reference to repentance in the preceding verse: David is singled out for special mention in view of the allusion, in surah {38}, to his having suddenly become aware that he had committed a sin, whereupon "he asked his Sustainer to forgive him his sin... and turned unto Him in repentance" ( 38:24 ).
Cf. xxi. 79-80, and notes 2733-34. David had the gift of song and sacred music, and this is shown in his Psalms. All nature-hills and birds-sing and echo back the Praises of Allah.
Iron or steel is hard stuff: but in the hands of a craftsman it becomes soft and pliable, and with it can be made instruments for the defence of righteousness. These, in the literal sense, are coats of mail, and defensive armour, and the manufacture of them is traditionally attributed to David.