Śatapatha Brāhmaṇa ("of a hundred paths") 8.4.4.9

8.4.4.9

tā haike 'nantarhitāstrivṛdvatībhyāmupadadhati | jihvāhanū iti vadanto yāścaturdaśa te hanū yāḥ ṣaṭ sā jihveti na tathā kuryādati te recayanti yathā pūrvayorhanvorapare hanū anūpadadhyādyathā pūrvasyāṃ jihvāyāmaparāṃ jihvāmanūpadadhyāttādṛktadyatrāhaiva śirastadeva hanū tajjihvā

Now some lay down these (rows of bricks) immediately after the two containing the Trivrit, saying, 'They are the tongue and the jaws: those fourteen are the jaws, and those six are the tongue.' Let him not do so: they cause a redundancy,--it would be just as if one were to put two other jaws to the already existing jaws, as if one were to put another tongue to the already existing tongue. That (brick) wherein the head is indeed (includes) the jaws and the tongue.