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YUSUFALI : Sad: By the Qur'an, Full of Admonition: (This is the Truth).

PICKTHAL : Sad. By the renowned Qur'an,

SHAKIR : Suad, I swear by the Quran, full of admonition.

M& HILALI : Sad

[These letters (Sad etc.) are one of the miracles of the Qur'an and none but Allah (Alone) knows their meanings]. By the Qur'an full of reminding.