صحيح ابن خزيمه
Sahih Ibn Khuzaymah
جماع أبواب صلاة الضحىChapters on Duha Prayer
(542) بَابُ ذِكْرِ عَدَدِ السُّلَامَى وَهِيَ الْمَفَاصِلُ الَّتِي عَلَيْهَا الصَّدَقَةُThe chapter on the number of joints, which are the bones upon which charity is due
Hadith Q1226
الَّتِي تُجْزِئُ رَكْعَتَا الضُّحَى مِنَ الصَّدَقَةِ الَّتِي عَلَى تِلْكَ الْمَفَاصِلِ كُلِّهَا
And the two rak'ahs of Duha suffice for the obligatory charity due on these joints.
