Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/24/22

यादृङ्नरं च सेवेत तादृशं फलमश्नुते।। महतस्सेवयोच्च त्वं क्षुद्रस्य क्षुद्रतां तथा ।। २२।।

sanskrit

Man attains fruits in accordance with the nature of the man one serves. Loftiness is achieved by serving the great and meanness by serving the mean.

english translation

yAdRGnaraM ca seveta tAdRzaM phalamaznute|| mahatassevayocca tvaM kSudrasya kSudratAM tathA || 22||

hk transliteration by Sanscript