Manusmriti
अग्नीनात्मनि वैतानान् समारोप्य यथाविधि । अनग्निरनिकेतः स्यान् मुनिर्मूलफलाशनः ॥ २५ ॥
Having reposited the three sacred fires in himself, according to the prescribed rule, let him live without a fire, without a house, wholly silent, subsisting on roots and fruit,
english translation
agnInAtmani vaitAnAn samAropya yathAvidhi । anagniraniketaH syAn munirmUlaphalAzanaH ॥ 25 ॥
hk transliteration by Sanscript