Agni is both equally the sacred fireplace and the deity of that hearth who transmits oblations to one other deities. Hence, this mantra is recited although invoking the deity Agni in the form of fireplace as witness into the vow. Agne vratapate vrataṃ cariṣyāmi (Vājasaneyī-Saṃstrikeā on the Śukla [White] Yajurveda https://ajax-directory.com/listings859023/top-mantra-secrets