Shiva Purana
जपेदक्षरलक्षं वै चतुर्गुणितमादरात् ॥ नक्ताशी संयमी यस्स पौरश्चरणिकः स्मृतः ॥ १८ ॥
One should chant the mantra with great reverence four times as much as one lakh syllables. He who eats nakta and is self-controlled is said to be a citizen of Charanika.
english translation
japedakSaralakSaM vai caturguNitamAdarAt ॥ naktAzI saMyamI yassa paurazcaraNikaH smRtaH ॥ 18 ॥
hk transliteration by Sanscript