Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
त्याज्याः स्युस्तासु तिथिषु क्रमात्पंच च सर्वदा ।अमावास्या च नवमी हित्वा विषमसंज्ञिका ॥ १३९ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 139.
In those tithis (moon days), these ghatikas (24-minute units) are always to be left, the five counts in order. Leaving out the new moon and the 9th, the tithis called odd ...
Simple meaning: Leave those time units in those moon days. Odd moon days, except the new moon and 9th, are good.
तिथयस्तुप्रशस्तास्युर्मध्यमा प्रतिपत्सिता ।
Odd moon days are good and the bright 1st is middling. Avoid oil on the 6th, meat on the 8th.
पूर्णिमादर्शयोर्नारीसेवनं परिवर्जयेत् ।
Avoid being with a woman on full-moon and new-moon days. The rule continues in the next verse.
नवम्यां च न कुर्वीत कदाचिद्दंतधावनम् ।
Never clean the teeth with a twig on these days. Oil massage rules begin for bad yoga and sign-entry days.