(347) بَابُ قَوْلِ الرَّجُلِ: إِنِّي كَسْلانُ
'A'isha said, "Do not forget to stand up at night to pray. TheProphet, may Allah bless him and grant him peace, did not neglect to doit. If he was either ill or lazy, he prayed sitting down."
Reference: Al-Adab Al-Mufrad 800
In-book reference: Book 33, Hadith 47
English translation: Book 33, Hadith 800