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For an explanation of the "double suffering, see surah {7}, note [29].
The above interpolation is, I believe, necessary in view of the highly elliptic character of this phrase. According to Tabari, Zamakhshari and Ibn Kathir. the meaning is that whereas God's punishment may befall the sinners referred to during their life on earth, it will certainly befall them in the hereafter. Cf. also 3:185 - "only on the Day of Resurrection will you be requited in full for whatever you have done."
Lit., "they were unable to hear and they did not see": cf. 2:7 and the corresponding note [7], as well as 7:179 .
Cf. vii. 38. In this context, it is implied that they committed a two-fold wrong: (1) in inventing falsehoods against Allah, which deadened their own soul, and (2) in leading others astray or hindering them from Allah's path. Thus they lost the faculty of hearing, which they might have used to hear the Word of Allah, and they blinded the faculty of sight by shutting out Allah's light.