Gobhilagrihyasutra 1.9.13

1.9.13

atha yadi gṛhye 'gnau sāyaṃprātarhomayor vā darśapūrṇamāsayor vā havyaṃ vā hotāraṃ vā nā 'dhigacchet, kathaṃ kuryād iti.

Now if he should not be able to get for the morning or for the evening oblation, or for the sacrifices of the full or of the new moon at his (sacred) domestic fire, any substance fit for sacrifice or a person who could sacrifice (instead of himself, if he is prevented): what ought he to do?