Atharvavedaparishishta 49.2.6

49.2.6

atha yajurvedaḥ prāṃśuḥ pralambajaṭharaḥ sthūlagalakapālo rakto varṇena prādeśāḥ ṣaḍ dīrghatvena yajurvedasyaitad rūpaṃ bhavati ||

Now the Yajurveda is tall, has a protruding belly, a thick neck and head, is red in colour, and is six spans in length; such is the bodily form of the Yajurveda.