أَلَمْ تَرَ كَيْفَ ضَرَبَ اللّهُ مَثَلاً كَلِمَةً طَيِّبَةً كَشَجَرةٍ طَيِّبَةٍ أَصْلُهَا ثَابِتٌ وَفَرْعُهَا فِي السَّمَاء
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سورة إبراهيم
(14/24) Beholdest thou not how Allah hath propounded the similitude of the clean word? It is like a clean tree, its root firmly fixed, and its branches reaching unto heaven.
Surah Ibrahim