4وَإِنَّهُ في أُمِّ الكِتابِ لَدَينا لَعَلِيٌّ حَكيمٌMuhammad AsadAnd, verily, [originating as it does] in the source, with Us, of all revelation,1 it is indeed sublime, full of wisdom.Cf. last clause of 13:39 - "with Him ('indahu) is the source (umm) of all revelation". The term umm (lit., "mother") has often the idiomatic connotation of "origin" or "source" (asi), and sometimes - as in 3:7 - of "essence". In the present context, only the former meaning is applicable. See also note 11 on the last verse of surah 85.