Ḥammād ibn Salamah—through Yaʿlā ibn ʿAṭāʾ, from Bujayr ibn Abī ʿUbayd—related:
“Ibn ʿAbbās died in al-Ṭāʾif. When they carried his bier out, a large white bird came from the direction of Wajj, worked its way into his shroud, and then was seen no more. People believed it was the embodiment of his knowledge.”

Ibn Ḥazm says in his book al-Iḥkām (1): “Abū Bakr Muḥammad ibn Mūsā ibn Yaʿqūb ibn al-Maʾmūn—one of the eminent authorities of Islam—gathered the legal opinions of Ibn ʿAbbās into twenty volumes.”

Aḥmad ibn Salāmah informed us in his book, citing Ibn Kulayb; Ibn Bayān told us; Ibn Makhlad told us; al-Ṣaffār told us; Ibn ʿArafah told us; Marwān ibn Shujāʿ narrated from Sālim al-Afṭas, from Saʿīd, who said:
“Ibn ʿAbbās died in al-Ṭāʾif. A bird the like of which had never been seen came and entered his bier, and it was not observed leaving. After he had been buried, this verse was recited at the edge of the grave—no one knew who recited it: ‘O tranquil soul, return to your Lord, well-pleased and well-pleasing’ (al-Fajr 89:27) (2).”

Bassām al-Ṣayrafī transmitted the same report from ʿAbd Allāh ibn Yāmīn (3), adding that the bird was called a ghurnūq.

Furāt ibn al-Sāʾib narrated it from Maymūn ibn Mihrān: “I was present at the funeral of Ibn ʿAbbās…,” in wording similar to the report of Sālim al-Afṭas (4).

Thus, the occurrence is corroborated by multiple independent chains and is, therefore, well-attested.