Ashvalayanagrihyasutra 4.5-10

4.5-10

ut te stabhnāmi iti kapālena apidhāya atha anavekṣam pratyāvrajya apa upaspṛśya śrāddham asmai dadyuḥ./

Having covered (the urn) with a lid with (the verse), 'I fasten to thee' (Rig-veda X, 18, 13), they then should go away without looking back, should bathe in water, and perform a Srâddha for the deceased.