Shrimad Bhagavad Gita
अफलाकाङ्क्षिभिर्यज्ञो विधिदृष्टो य इज्यते । यष्टव्यमेवेति मनः समाधाय स सात्त्विकः ॥ १७-११॥
That sacrifice which is offered by men without desire for reward as enjoined by Shaastra (scripture), with a firm faith that to do so is a duty, is done through sattva.
english translation
यज्ञ करना कर्तव्य है -- इस तरह मनको समाधान करके फलेच्छारहित मनुष्योंद्वारा जो शास्त्रविधिसे नियत यज्ञ किया जाता है, वह सात्त्विक है।
hindi translation
aphalAkAGkSibhiryajJo vidhidRSTo ya ijyate । yaSTavyameveti manaH samAdhAya sa sAttvikaH ॥ 17-11॥
hk transliteration by Sanscript