In the Musnad of Ibn al-Jaʿd (1: 275, no. 41) edited by ʿAbd al-Hādī, the following dream is mentioned:

ʿAlī b. Mus-hir said that he and Ḥamzah al-Zayyāt (d. 156/8) heard 500 or so traditions from Abān b. Abī ʿAyyāsh.

Ḥamzah told ʿAlī, “I saw the Prophet ﷺ in a dream and presented them to him; he did not recognise any of them except a few – five or six – aḥādīth, so I abandoned [taking] ḥadīth from him.”

Although transmitters and their reports are not graded based upon dreams, this particular dream was sound because the Imāms of Jarḥ and Taʿdīl (Accreditation and Impugnment), who investigated Abān’s reports, said the following regarding him:

Yaḥyá b. Maʿīn (d. 233) said, “Weak.”

He also said, “His ḥadīth are nothing.”

He also said, “Abān is abandoned in ḥadīth.”

Aḥmad b. Ḥanbal (d. 241) said, “Abān b. Abī ʿAyyāsh is abandoned in ḥadīth, people abandoned his ḥadīth from long ago. When Wakīʿ would come across his ḥadīth, he would say, ‘a man’ and not name him due to deeming him weak.”

Aḥmad b. Ḥumayd said he heard Aḥmad b. Ḥanbal say, “Nothing should be written from Abān b. Abī ʿAyyāsh.” Ibn Ḥumayd said, “Is he affected by innovation?” He replied, “He was rejected in ḥadīth.”

ʿAmr b. ʿAlī (d. 249) said, “Abandoned in ḥadīth, although he is a righteous man.”

He also said, “Yaḥyá [b. Maʿīn] and ʿAbd al-Raḥmān [b. Mahdī] would not narrate from him.”

al-Bukhārī (d. 256) said, “Shuʿbah (d. 160) used to think poorly of him.”

When Abū Zurʿah (d. 264) was asked whether Abān lied deliberately, he replied, “No, he used to hear ḥadīth from Anas [b. Mālik], Shahr [b. Ḥawshab], and al-Ḥasan [al-Baṣrī], and then not make a distinction between them.”

Abū Ḥātim al-Rāzī (d. 277) said, “Abandoned in ḥadīth, and he was a righteous man, however he was afflicted with a poor memory.”

al-Nasāʾī (d. 303) said, “Abandoned in ḥadīth.” He also said, “Unreliable, and his ḥadīth are not [to be] written down.”

See: Tahdhīb al-Kamāl of al-Mizzī (2: 19 onwards) ed. Bashshār ʿAwwād Maʿrūf.