13. Verily, those who say: "Our Lord is (only) Allâh," and thereafter stand firm and straight on the Islâmic Faith of Monotheism,[2] on them shall be no fear, nor shall they grieve.
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(V.46:13): stand firm on the Islamic Monotheism i.e. by abstaining from all kinds of sins and evil deeds which Allâh has forbidden and by performing all kinds of good deeds which He has ordained. [See the footnote of (v.41:30)].