But the asuras, jealous, tried to separate the sticks. They said, “Dry wood and wet wood cannot burn together. Separate them — put one on the northern altar, one on the southern.”
Then the priest whispered the verse. And the two sticks began to glow — not from outside heat, but from within. The Aśvattha yielded its latent fire (the god Agni hidden in its pith). The Nyagrodha yielded its sap, which turned to steam and then to flame. The two different natures met: dry and wet, still and moving, giving and receiving. They burned together, not as two sticks, but as one flame with two colors — one gold, one silver. 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. But the asuras, jealous, tried to separate the sticks