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Sakka-pañha Sutta: Sakka's Questions.
http://www.accesstoinsight.org/tipitaka/dn/dn.21.2x.than.html
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As per the Story of the Youth Magha... It is found in the Dhammapada Commentary – in Book II. Heedfulness, Appamāda Vagga. Under that chapter II. 7. Is about “How Magha Became Sakka”.
You could also read about it HERE