A man came to Hasan al-Basree and said:

ﻳﺎ ﺃﺑﺎ ﺳﻌﻴﺪ، ﺇﻧﻲ ﺃﺭﻳﺪ ﺃﻥ ﺃﺧﺎﺻﻤﻚ

“O Abu Sufyaan, Let me debate with you about the Religion”

Hasan al-Basree 110 AH replied,

ﺇﻟﻴﻚ ﻋﻨﻲ ، ﻓﺈﻧﻲ ﻗﺪ ﻋﺮﻓﺖ ﺩﻳﻨﻲ، ﻭﺇﻧﻤﺎ ﻳﺨﺎﺻﻤﻚ ﺍﻟﺸﺎﻙ ﻓﻲ ﺩﻳﻨﻪ

“Get away from me! As for me, I know my religion, if you have lost your Religion then go and look for it.”

Source: Al-Aajurry collected it in his book “ash-Shareeah” and al-Lalikaaee in his “Usool ‘Itiqaad”