I say: Perhaps he meant that it was complete in this form; otherwise, Ibn ʿUmar also narrated it, as mentioned previously. Al-Haythami deemed it defective in Majmaʿ al-Zawaʾid (2/168), saying: “ʿUbayd Allah ibn Zahr and ʿAli ibn Yazid are both weak.” However, he also attributed it to al-Tabarani in both al-Kabir and al-Awsat; it appears in al-Kabir as no. 366.

1567 — “If you are fasting, then fast on the bright days—that is, the White Days.”

Al-Nasaʾi (1/328), Ibn Hibban (945), and Ahmad (2/336 and 346) narrated it through Abu ʿAwanah, from ʿAbd al-Malik ibn ʿUmayr, from Musa ibn Talhah, from Abu Hurayrah, who said: “A Bedouin came to the Messenger of Allah (peace and blessings be upon him) with a roasted rabbit and its seasoning, and placed it before him. The Messenger of Allah (peace and blessings be upon him) refrained from eating, and his Companions also refrained from eating; the Bedouin likewise refrained. So the Messenger of Allah (peace and blessings be upon him) asked, ‘What prevents you from eating?’ He replied, ‘I fast three days of every month.’ He said: ‘If you are fasting, then fast on the bright days—that is, the White Days.’”

I say: This chain of transmission consists of trustworthy narrators, all of them narrators of the two Sahihs, except that ʿAbd al-Malik ibn ʿUmayr was described by al-Hafiz in al-Taqrib as: “Trustworthy and a jurist, but his memory deteriorated, and he occasionally practised tadlis (concealing a narrator in the chain).” Yahya ibn Sam differed from him, narrating it from Musa ibn Talhah, from Abu Dharr, who said: “The Messenger of Allah (peace and blessings be upon him) instructed us to fast three White Days of each month: the thirteenth, fourteenth, and fifteenth.” Al-Nasaʾi (1/328–329), Ibn Hibban (943), al-Bayhaqi in al-Sunan (4/294), and Ahmad (5/152 and 177) narrated it.