In the Krishna Yajur Veda, Taittriya Samhita, there is a mantra that uses many descriptive words referring to the Supreme One. Each of these can be seen in the context of various archa (idol) forms of Lord Narayana, said V.S. Karunakarachariar in a discourse.
The first mantra in the apratiratha section praises Indra. Indra means one who is wealthy beyond imagination. Who can be wealthier than the One whose Consort is the Goddess of wealth — Mahalakshmi? So when Indra is praised, it is obviously praise of Lord Narayana. Sri Vaishnava tradition says all other Vishnu temples are the gardens of Ranganatha of Srirangam. So the archa form of the Lord as Ranganatha is the wealthy One that the Vedic mantra praises.
The mantra uses the word ‘Asu.’ Asu means one who acts speedily. And there is an archa form that indicates His speed. There is a temple in Kanchipuram, where the Lord has eight hands. The reason for this is because in His anxiousness to save His devotee, He manifests with more hands.
The word sisaana, indicating sharpness, can be taken to be a reference to Lord Narasimha of the Velukkai temple, also in Kanchipuram. Narasimha didn’t need any weapons to kill Hiranyakasipu. His sharp nails were enough. The mantra also says the Supreme One is like a bull in His warring ability. Lord Vijayaraghava of Tiruputtkuzhi, near Kanchi, is described as a warring bull. So the Vedic reference to a bull can be taken as a reference to Lord Vijayaraghava.
The Veda says He is ‘ghanaaghana.’ That means He is the One who vanquishes His enemies. In terms of archa forms, this can be taken to refer to Pandavadootha of Kanchi. Here we see Lord Krishna is in the Viswarupa form, which He assumed in Duryodhana’s court and destroyed Duryodhana’s men.