The Law Code of Yājñavalkya 3.1.136

3.1.136

jalaṃ kṣīraṃ ca mṛnmaye pātradvaye pṛthak pṛthag ākāśe śikyādāv ekāhaṃ sthāpanīyam | atra viśeṣānupādānāt prathame 'hani kāryam, tathā pāraskaravacanāt: pretātra snāhīty udakaṃ sthāpyaṃ piba cedam iti kṣīram | tathāsthisaṃcayanaṃ ca prathamādidineṣu kāryam | tathāha saṃvartaḥ |

Water and milk are to be placed separately in two earthen vessels in the open air, on a hanging net or the like, for one day. Here, because no specific day is mentioned, it should be done on the first day, as is stated by Pāraskara: “Water should be placed, saying, ‘O departed one, bathe here,’ and milk, saying, ‘And drink this.’” Likewise, the gathering of the bones should be performed on the first or following days. Thus Saṃvarta has said: