"I said to 'Aishah: 'Which deed was most beloved to the Messenger of Allah (ﷺ)?' She said: 'That which was done persistently.' I said: 'At what part of the night did he pray Qiyam?' She said: 'When he heard the rooster.'"
Reference: Sunan an-Nasa'i 1616 In-book : Book 20, Hadith 19 English translation : Vol. 2, Book 20, Hadith 1617
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