The Book of Mosques and Places of Prayer
5/31. Chapter:
The times of the five prayers
Sahih Muslim
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى التَّمِيمِيُّ، قَالَ أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ يَحْيَى بْنِ أَبِي كَثِيرٍ، قَالَ سَمِعْتُ أَبِي يَقُولُ، لاَ يُسْتَطَاعُ الْعِلْمُ بِرَاحَةِ الْجِسْمِ .
'Abdullah narrated it on the authority of his father Yahya: Knowledge cannot be acquired with sloth.
Reference : Sahih Muslim 612fIn-book reference : Book 5, Hadith 224USC-MSA web (English) reference : Book 4, Hadith 1277