اصطفاه doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• اصطفاهُ Form 8

  8 اصطفاهُ ذ : see 1, last sentence but one. -b2- Also He took it clear, limpid, or pure; (M, TA;) and so [accord. to SM, which, however, I think doubtful,] , which is expl. in the K as signifying he reckoned it clear, li…

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