Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
अर्कभौमदिने षष्ठ्यां नाभ्यंगो वैधृतौ तथा ।यः करोति दशम्यां च स्नानमामलकैर्नरः ॥ १४३ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 143.
... and on Sunday, Tuesday and the 6th, there is no oil massage. Nor on vaidhriti (a bad Sun and Moon yoga). A man who bathes with amla fruit on the 10th ...
Simple meaning: No oil massage on Sunday, Tuesday, the 6th or bad yoga days. Rules for amla bathing follow.
पुत्रहानिर्भवेत्तस्य त्रयोदश्यां धनक्षयः ।
Amla bathing on the 10th risks grief over a son; the 13th, wealth; the 2nd, both.
अमायां च नवम्यां च सप्तम्यां च कुलक्षयः ।
This may harm the family on a new moon, 9th or 7th. A full moon with the Moon by day is Anumati.
रात्रौ चन्द्रवती राकाप्यमावास्या तथा द्विधा ।
A full moon at night is Raka. A new moon with a trace of Moon is Sinivali, without it Kuhu.