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In ancient Arabian tradition, the terms "day" or "days" were often used to describe momentous historical events (e.g., ayyam al-'arab as a metonym for the inter-tribal wars of pre-Islamic Arabia). However, in view of the frequent Qur'anic application of the word "day" to eschatological concepts - e.g., the "Last Day", the "Day of Resurrection", the "Day of Reckoning", and so forth - and, particularly, in view of 45:14 , where the expression "the Days of God" unmistakably points to His judgment at the end of time - it is only logical to assume that in the present context this expression bears the same significance: namely, God's final judgment of man on the Day of Resurrection. The use of the plural form ("the Days of God") is perhaps meant to bring out the idea that the "Day" of which the Qur'an so often speaks has nothing to do with human time-definitions but, rather, alludes to an ultimate reality in which the concept of "time" has neither place nor meaning.
"The Days of Allah": the days when Allah's mercy was specially shown to them. Every day and every hour and minute, Allah's grace flows to us abundantly, but there are special events in personal or national history which may be commemorated as Red-letter Days. Those to the Israelites were set out in great detail in ii. 30-61 and on other places.
Sabbar is the intensive form, and includes all the ideas implied in Sabr (ii. 45 and n. 61, and ii. 153 n. 157) in an intensive degree. Shakur and Shakir have in them the idea of appreciation, recognition, gratitude as shown in deeds of goodness and righteousness. Both terms are applied to Allah as well as to men. A slight distinction in shades of meaning may be noted. Shakur implies that the appreciation is even for the smallest favours and response on the other side; it is a mental attitude independent of specific facts. Shakir implies bigger and more specific things.