Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
चतुर्विंशत्त्रयोविंशत्षोडशद्वादशांगुलैः ।विप्रादीनां कुक्षिमानं स्वर्णवस्त्राद्यलंकृतम् ॥ ५७३ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 573.
The belly measure of the Brahmin and the other classes is 24, 23, 16 and 12 finger-widths in order. The peg is dressed with gold, cloth and so on.
Simple meaning: The measure is 24, 23, 16 or 12 finger-widths for the four classes. The peg is dressed with gold and cloth.
खदिरार्जुनशालोत्थं युगयंत्रं तरूद्भवम् ।
The peg is made of wood such as khadira, arjuna, shala or red sandalwood.
शंकुं त्रिधा विभज्याद्यं चतुरस्रं ततः परम् ।
Make the peg in three parts: four-sided, eight-sided and 14-sided. It must be smooth and flawless.
एवं लक्षणसंयुक्तं परिकल्प्य शुभे दिने ।
Make the peg on a good day and set it on ground marked out with the thread.