Shiva Purana

siva.sh/siva-purana/vishweshwara-samhita/11/66

एवं ज्ञात्वा नरः कुर्वन्यथोक्तफलभाग्भवेत् । कलौ युगे विशेषेण फलसिद्धिस्तु कर्मणा ६६ ।

sanskrit

If a man performs rites after realising this, he shall achieve the due results. Especially in the Kali age the achievement of fruit is only due to the precise performance of actions.

english translation

evaM jJAtvA naraH kurvanyathoktaphalabhAgbhavet | kalau yuge vizeSeNa phalasiddhistu karmaNA 66 |

hk transliteration by Sanscript