Vaishnava Dharmashastra 11.10

11.10

karau vimṛditavrīhes tasyādāv eva lakṣayet
abhimantryāsya karayor lohapiṇḍaṃ tato nyaset //

At the beginning (of the whole ceremony) the judge shall cause the person to rub some rice in his hands, and shall mark (with red sap, or the like, the already existing scars, eruptions of the skin, &c., which will thus have become visible). Then the judge, after having addressed the iron ball (with the following prayer), shall place it in his hands:
'Thou, O fire, dwellest in the interior of all creatures, like a witness. O fire, thou knowest what mortals do not comprehend.