مختصر صحيح بخاري
Mukhtasar Sahih Bukhari
Book of Tahajjud Prayer
It is disliked to abandon night prayer if one is accustomed to it.
Narrated Abdullah bin Amr bin Al-As (may Allah be pleased with him): The Messenger of Allah (peace and blessings of Allah be upon him) once said to me: "O Abdullah! Do not be like so-and-so; he used to get up at night for prayer, then he abandoned getting up at night and praying."
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