Shiva Purana
चक्रं सुदर्शनं प्राप्तं विष्णुनेति श्रुतं पुरा ॥ तदाराधनतस्तात तत्कथा च विशेषतः ॥ ३ ॥
O dear, this was heard by us formerly that by propitiating Harīśvara, Viṣṇu acquired his discus Sudarśana. Please narrate that story particularly.
english translation
cakraM sudarzanaM prAptaM viSNuneti zrutaM purA ॥ tadArAdhanatastAta tatkathA ca vizeSataH ॥ 3 ॥
hk transliteration by Sanscript