Manava Dharmashastra 4.56

4.56

lohitaṃ rudhiram | viṣāṇīti bahuvacanaṃ kṛtrimākṛtrimabhedena sthāvarajaṅgamabhedena garādiprakārabhedena vā |

He shall not throw into water urine, or faeces, or spittings, or anything else contaminated by unclean things, or blood or poisons.—(56).

Medhātithi’s commentary (manubhāṣya):
‘Lohita’—Blood.

‘Poisons.’—The plural number is used, in view of there being several kinds of poison, which are divided into ‘natural’ and ‘artificial,’ or into ‘moveable’ and ‘immoveable,’ or into the various varieties of ‘gara’ and the rest.—(56).

Comparative notes by various authors
Āpastamba Dharmasūtra (1.30.18).—‘He shall not urinate or stool with shoes on; nor in a ploughed field, nor on the path, nor in water; such acts also he shall avoid as spitting in water.’

Viṣṇu (71.32.35).—‘He shall not throw any unclean thing into the fire, nor blood, nor poison;—not also in water.’

Yājñavalkya (1.137).—‘He shall not throw into water spittings, or blood, or faeces, or urine, or semen.’