Shiva Purana
सर्वं कृतमकामेन साक्षाच्छिवपदप्रदम् । प्रातर्मध्याह्नसायाह्नमहस्त्रिष्वेकतः क्रमात् ६३ ।
All actions performed without desire (selflessly) directly lead to the supreme path of Shiva. One should perform them at three times of the day — morning, noon, and evening, in a proper sequence.
english translation
sarvaM kRtamakAmena sAkSAcchivapadapradam । prAtarmadhyAhnasAyAhnamahastriSvekataH kramAt 63 ।
hk transliteration by Sanscript