Valmiki Ramayana Ayodhya Kanda Sarga 61 Shloka 17

हविः offering to the Firegod, आज्यम् ghee, पुरोडाशाः sacrificial cakes, कुशाः kusha grass, खादिराः khadira wood, यूपाश्च sacrificial posts, यातयामानि after the lapse of one Yama (three hours), एतानि all these, अध्वरे in the sacrifice, पुनः again, न कुर्वन्ति will not be used.

Havis, sacrificial offerings like ghee, cakes, kusha grass, and sacrificial posts made from khadira wood, once used in the sacrifice cannot be used again.