Agni Is both of those the sacred hearth and the deity of that fire who transmits oblations to the opposite deities. Hence, this mantra is recited whilst invoking the deity Agni in the shape of hearth as witness towards the vow. Agne vratapate vrataṃ cariṣyāmi (Vājasaneyī-Saṃstrikeā with the Śukla [White] https://www.instagram.com/tantramantraaurvigyaan/