Manava Dharmashastra 11.105

11.105

khaṭvāṅgī cīravāsā vā śmaśrulo vijane vane
prājāpatyaṃ caret kṛcchram abdam ekaṃ samāhitaḥ //

Or, having himself cut off his organ and his testicles and having taken them in his joined hands, he may walk straight towards the region of Nirriti (the south-west), until he falls down (dead);