'The Commander of the Faithful (AS) did not used to sleep at all on three nights: the rd night of the month of Ramadan, the eve of 'id al-fitr, and the eve of the th of Sha'ban. And these are the nights when sustenance is allotted, and prescribed times of death and all that is to happen in that year is decreed.'
Imam Ali ibn Musa al-Ridha [as]
Bihar al-Anwar, v. 97, p. 88, no. 15
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