Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
कृष्णपक्षे त्विष्टमध्यानिष्टदाः क्रमशस्तदा ।अष्टमी द्वादशी षष्ठी चतुर्थी च चतुर्दशी ॥ १३७ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 137.
In the dark fortnight they give good, middling and bad results, in that order. The 8th, 12th, 6th, 4th and 14th tithis (moon days) ...
Simple meaning: In the dark fortnight the three rounds are good, middling, then bad. The 8th, 12th, 6th, 4th and 14th moon days follow.
तिथयः पक्षरंध्राख्या ह्यतिरूक्षा प्रकीर्तिताः ।
The 8th, 12th, 6th, 4th and 14th moon days are harsh. A set number of time units is given for each.
त्याज्याः स्युस्तासु तिथिषु क्रमात्पंच च सर्वदा ।
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.