Krishna Yajur Veda 7.4.19 -

From that flame rose a new fire. Its smoke carried two scents: the resin of the father-tree and the milk of the mother-tree. That smoke reached the gods, and the gods grew strong again.

The great seer (eldest of the fire-priests) approached Prajapati, the Lord of Creatures. krishna yajur veda 7.4.19

From that day, no Vedic priest would offer the samidhs singly. They always placed the Aśvattha and Nyagrodha together, reciting that verse. And they taught their students: “In every sacrifice, what seems opposite must be paired. Dry with wet, male with female, above with below. That is the secret of the Krishna Yajur Veda 7.4.19: The two become one, and from that oneness, fire is born.” The verse encodes the principle of dvandva — the sacred pair. In later traditions, this became the symbolism of Ardhanarishvara (Shiva and Parvati as one body), or the union of sun and moon, or the two breaths ( prāṇa and apāna ) in yoga. The story reminds us that no single element can sustain the sacred fire of life — only the embrace of opposites. From that flame rose a new fire

However, since you asked for a , here is a narrative inspired by the symbolism, the dual nature of the sticks (male/female, fire/water, heaven/earth), and the Vedic ritual context. The Twin Flames of the Altar Long ago, when the gods and asuras were locked in an eternal struggle for the sacrifice itself, the sacrificial fire on earth began to flicker and wane. Without the fire, the rishis could not send oblations to heaven, and the gods grew weak. The great seer (eldest of the fire-priests) approached

The verse (often cited in the Taittirīya Saṃhitā ) deals with a ritual concerning the Vedī (sacrificial altar) and the placement of two kinds of fuel sticks ( samidhs ) — one from the Aśvattha (sacred fig) and one from Nyagrodha (banyan). The verse states that these two are placed together, and they are addressed as “twin-born” or “paired.”