Agniveshyagrihyasutra 3.7.3.20

3.7.3.20

patho etaddhaviryajñiyaṃ nivapanaṃ punardahanaṃ ceti yadahaḥ saṃcinuyāt tadaharevaitat kuryāt \

Now as to this: the [burial of the urn for the] sacrificial cake offerer, the strewing, and the re-cremation—on whichever day one collects [the bones], on that very day one should do this.