Reference: Siyar A’laam an-Nubalaa – Volume 10, Page 257
Hamdaan ibn Sahl al-Balkhee said:
Other than al-Qa’nabee (rahima-hullaah), I have not seen anyone who by the mere sight of them they would evoke others to remember Allaah Ta’aala.
If he were to pass by a gathering [of people] they would say: [لا إله إلا الله].
And it was said that he was called a monk due to his worship and excellence.
