Rigveda 1.164.24

गा॒य॒त्रेण॒ प्रति॑ मिमीते अ॒र्कम॒र्केण॒ साम॒ त्रैष्टु॑भेन वा॒कम् ।वा॒केन॑ वा॒कं द्वि॒पदा॒ चतु॑ष्पदा॒ ऽक्षरे॑ण मिमते स॒प्त वाणी॑:॥

gāyatreṇa prati mimīte arkamarkeṇa sāma traiṣṭubhena vākam |vākena vākaṃ dvipadā catuṣpadā 'kṣareṇa mimate sapta vāṇī: ||

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