Narrated Abu Hurairah: The Messenger of Allah ﷺ as saying: The most excellent fast after Ramadan is Allah's month al-Muharram, and the most excellent prayer after the prescribed prayer is the prayer during night.
Hadith Referenceسنن ابي داود / كتاب الصيام / 2429
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم (1163)
Narrated Uthman bin Hakim: I asked Saeed bin Jubair about fasting during Rajab. He said: Ibn Abbas told me that the Messenger of Allah ﷺ used to fast to such an extent that we thought that he would never break his fast ; and he would go without fasting to such and extent that he would never fast.
Hadith Referenceسنن ابي داود / كتاب الصيام / 2430
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح بخاري (1971 مختصرًا) صحيح مسلم (1157)
Hadith Takhrij« صحیح مسلم/الصیام 34 (1157)، (تحفة الأشراف: 5554)، وقد أخرجہ: سنن النسائی/ الصیام 41 (2348، 2348)، سنن ابن ماجہ/الصیام 30 (1711)، مسند احمد (1/226، 227، 231، 326) (صحیح) »