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Ash Shakur is translated into "The Appreciative". In his book, "Al-Maqsad Al-Asna fi Sharah Asma' Allahu al-Husna" (aka The best means in explaining Allah's Beautiful Names), Imam Al Ghazali translates Ash Shakur as "The One Who Expresses Thankfulness by rewarding bounteously". He goes on to say that Ash Shakur is "the One Who rewards trivial pious deeds with many grades, and the one who gives unlimited happiness in the life to come for activity during a limited period (in this life). The one who rewards the good deed with multiples of it is said to be thankful for that good deed, and the one who praises the performer of this good deed is also said to be thankful for it. If you consider multiple rewards (to be the criterion in this matter), then there can be no absolute Ash Shakur except God Most High, because His increase of the reward is not restricted and limited since the blessings of Paradise are infinite."
Ash Shakur can be found in various ayat in the Quran. For example, it is found in verses 35:30, 35:34, 42:23, 64:17. Muslims tend to quote verse 2:261 when mentioning Allah's Generosity and Gratefulness, "The likeness of those who spend their wealth in Allah's way is as the likeness of a grain which grows seven ears, in every ear a hundred grains. Allah gives increase manifold to whom He Will. Allah is All-Embracing, All-Knowing."