—from Anas (may Allah be pleased with him), who said:
The Prophet (peace and blessings be upon him) said: “The likeness of a righteous companion is that of a perfume-seller: even if his perfume itself does not reach you—or, he said, he gives you some of it—you will still enjoy his pleasant fragrance. And the likeness of an evil companion is that of the blacksmith: if he does not burn your clothes, you will nevertheless be affected by his foul odor.”
This ḥadīth possesses an authentic chain of transmission and is singular.
Shubayl is reliable and was counted among the leading masters of Arabic.
Abū Dāwūd recorded it in his Sunan (1) through the route of ʿAbd Allāh ibn al-Ṣabbāḥ, from Saʿīd ibn ʿĀmir; our own route is therefore higher by two levels.

125 – ʿAlī al-Riḍā ibn Mūsā al-Kāẓim al-Hāshimī al-ʿAlawī
The Imām, the noble sayyid, Abū al-Ḥasan ʿAlī al-Riḍā ibn Mūsā al-Kāẓim ibn Jaʿfar al-Ṣādiq ibn Muḥammad al-Bāqir ibn ʿAlī ibn al-Ḥusayn, a Hāshimite, an ʿAlawī, and a native of Medina.
His mother was a Nubian woman named Sukaynah.
He was born in Medina in 148 AH, the year his grandfather passed away.
He received ḥadīth from his father and from his uncles—Ismāʿīl, Isḥāq, ʿAbd Allāh, and ʿAlī, the sons of Jaʿfar—as well as from ʿAbd al-Raḥmān ibn Abī al-Mawālī, and he was endowed with knowledge