Hadith 636
من صام يوما تطوعا فلو أعطى ملء الأرض ذهبا ما وفى بأجره
“If someone observes a voluntary fast, even if he is given gold equal to the earth in return, its reward is still not fully given.”
Hadith 637
من صام يوما تطوعا لم يطلع عليه أحد لم يرض الله له بثواب دون الجنة
"Whoever observed a voluntary fast and no one came to know about it, Allah Almighty will please him in return by granting him nothing less than Paradise."
