A man came to the Prophet ﷺ and said, "Messenger of Allah, my mother has died and she owed a month of fasting. Shall I make it up on her behalf?"He replied, "If your mother had owed a debt, would you have paid it on her behalf?"The man said, "Yes."He said, "Then a debt owed to Allah is even more deserving of being paid."Sulayman said, Hakam and Salama bin Kuhayl, while we were all sitting together when Muslim narrated this hadith, both said, "We heard Mujahid mention this from Ibn Abbas."
حدثنا معاوية حدثنا زائدة عن الأعمش عن مسلم البطين عن سعيد بن جبير
جاء رجل إلى النبي ﷺ فقال يا رسول الله إن أمي ماتت وعليها صوم شهر أفأقضيه عنها فقال لو كان على أمك دين أكنت قاضيه عنها قال نعم قال فدين الله أحق أن يقضى قال سليمان فقال الحكم وسلمة بن كهيل ونحن جميعا جلوس حين حدث مسلم بهذا الحديث قالا سمعنا مجاهدا يذكر هذا عن ابن عباس
Its isnad is sahih, and it is a repetition of 2005. See also 3049. Sulayman is Amash, Sulayman bin Mihran. What Amash mentioned here are two other sahih isnads for the hadith, he heard it from Muslim Batin from Saeed bin Jubayr, and from Hakam bin Utayba and Salama bin Kuhayl from Mujahid, both of them from Ibn Abbas.His words, "the hadith of Muslim," in H, "the hadith Muslim," which is a clear error, and we have corrected it from K.