Rigveda 1.31.13

त्वम॑ग्ने॒ यज्य॑वे पा॒युरन्त॑रो ऽनिष॒ङ्गाय॑ चतुर॒क्ष इ॑ध्यसे ।यो रा॒तह॑व्यो ऽवृ॒काय॒ धाय॑से की॒रेश्चि॒न् मन्त्रं॒ मन॑सा व॒नोषि॒ तम्॥

tvamagne yajyave pāyurantaro 'niṣaṅgāya caturakṣa idhyase |yo rātahavyo 'vṛkāya dhāyase kīreścin mantraṃ manasā vanoṣi tam ||

Our plain-language meaning of this verse is waiting for scholar review.