Shatapatha Brahmana 14.3.1.14

14.3.1.14

tam vai pariṣyanda utsādayet tapto vā eṣa śuśucāno bhavati taṃ yadasyāmutsādayedimāmasya śugṛcedyadapsūtsādayedapo'sya śugṛcedatha yatpariṣyanda utsādayati tatho ha naivāpo hinasti nemāṃ yadahāpsu na prāsyati tenāpo na hinastyatha yatsamantamāpaḥ pariyanti śāntirvā āpasteno imāṃ na hinasti tasmātpariṣyanda utsādayet

Let him 'set out' that (Pravargya) on an island; for, when heated, it becomes burning-hot; and were he to set it out on this (earth), its heat would enter this (earth); and were he to set it out on water, its heat would enter the water; but when he sets it out on an island--thus, indeed, it does not injure either the water or this (earth), for inasmuch as he does not throw it into the water, it does not injure the water; and inasmuch as the water flows all round it--water being a means of soothing--it does not injure this (earth): let him therefore set it out on an island.