“Its chain of transmission is authentic.”

Al-Haythamī said (4/309):

“Al-Bazzār reported it through two chains of transmission, as did al-Ṭabarānī; and the narrators of one of al-Bazzār’s chains are narrators of the authentic collections.”

ʿAbd al-Ḥaqq al-Ishbīlī also graded it authentic by his silence concerning it in al-Aḥkām al-Kubrā (folio 144/1), and by including it in al-Aḥkām al-Ṣughrā (folio 153/1), which he devoted to authentic hadiths.

290 — “No; rather, let him pledge allegiance to Islam, for there is no migration after the Conquest of Mecca, and he will be among those who follow in excellence.”

Imām Aḥmad recorded it (3/468, 469) from Abū Muʿāwiyah Shaybān, from Yaḥyā ibn Abī Kathīr, from Yaḥyā ibn Isḥāq, from Mujāshiʿ ibn Masʿūd:

He came to the Prophet, peace and blessings be upon him, with a nephew of his, to pledge allegiance for migration. The Messenger of Allah, peace and blessings be upon him, then said: “...” and he cited it.

I say: This is an authentic chain of transmission. All its narrators are trustworthy and are among the narrators used by the two Shaykhs, except Yaḥyā ibn Isḥāq, who was an Anṣārī. Ibn Maʿīn and Ibn Ḥibbān said: “Trustworthy.” Al-Ḥāfiẓ likewise said so in al-Taqrīb.

He then recorded it by way of Abū ʿUthmān al-Nahdī, from Mujāshiʿ ibn Masʿūd, who said: