مشكوة المصابيح
Mishkat al-Masabih
كتاب الصلاة
The Book of Prayer
(يَجِبُ الْعِبَادَةُ مَا دَامَ الْقَلْبُ يَشْتَهِي)
(Worship should be performed as long as the heart desires)
Hadith 1244
وَعَنْ أَنَسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: لِيُصَلِّ أَحَدُكُمْ نَشَاطَهُ وَإِذَا فَتَرَ فَلْيَقْعُدْ)
Anas reported God’s Messenger as saying, “One should pray as long as he is lively, but when he slackens he should stop.” (Bukhari and Muslim.)
