It was recorded by Ibn Abī Shaybah in al-Muṣannaf (2/242) and al-Ṭayālisī in his Musnad (257/1893). Both said: Abū al-Aḥwaṣ narrated it to us from him.

Mūsā ibn Dāwūd differed from them in the text, saying: Abū al-Aḥwaṣ narrated it to us from him, without the additional wording.

It was recorded by al-Ṭabarānī (12/415/13528).

Mūsā ibn Dāwūd was al-Ḍabbī. Al-Ḥāfiẓ said:

“Truthful, a jurist and ascetic, though prone to errors.”

Thus, his divergence causes no harm, for an addition made by a trustworthy narrator is accepted—especially when, as is evident here, it comes from two trustworthy narrators with strong memories.

The hadith has two further chains from Ibn ʿUmar, but both are weak:

The first is from Layth, from Nāfiʿ, from Ibn ʿUmar, who said:

“I observed the Prophet (peace and blessings be upon him) for twenty nights, or twenty-five nights, or a month …” to the end of the hadith, including the additional wording.

It was recorded by Ibn Naṣr al-Marwazī in Qiyām al-Layl (p. 31, Hindiyyah Rifāh edition).

I say: Its narrators are trustworthy narrators used by al-Bukhārī, apart from Layth—who is Ibn Abī Sulaym. Al-Dhahabī said in al-Kāshif:

“He has a slight weakness due to his poor retention.”

I say: That was due to his confusion in later life; thus, one like him may be cited as corroboration.

The other chain is narrated by Ismāʿīl ibn ʿAmr al-Bajalī: Isrāʾīl narrated to us from Thuwayr ibn Abī Fākhtah, from Ibn ʿUmar, with the same wording.