Manava Dharmashastra 5.101

5.101

asapiṇḍaṃ dvijaṃ pretaṃ vipro nirhṛtya bandhuvat
viśudhyati trirātreṇa mātur āptāṃś ca bāndhavān //

A Brahmana, having carried out a dead Brahmana who is not a Sapinda, as (if he were) a (near) relative, or a near relative of his mother, becomes pure after three days;