Rishi: Traditionally connected with Ṛgvedic Aśvamedha materials; in VS transmission often left as ‘ṛṣiḥ’ implicit for the section.
Devata: Tvaṣṭṛ (and by extension the cosmic maker-power operative in the yajña).
Chandas: Triṣṭubh-like cadence (Ṛgvedic provenance; exact metrical regularity varies in Yajus citation).
Samhita Patha (Devanagari)त्वष्टा॑ वी॒रं दे॒वका॑मं जजान॒ त्वष्टु॒रर्वा॑ जायत आ॒शुरश्व॑ः । त्वष्टे॒दं विश्वं॒ भुव॑नं जजान ब॒होः क॒र्तार॑मि॒ह य॑क्षि होतः
Transliterationtváṣṭā vīráṃ devákāmaṃ jajāna | tváṣṭur árvā jāyata āśúr áśvaḥ || tváṣṭedáṃ víśvaṃ bhúvanaṃ jajāna bahóḥ kartā́ram ihá yákṣi hotaḥ |
Translationทวัสฏฤ (Tvaṣṭṛ) ให้กำเนิดวีรบุรุษผู้ปรารถนาเทพทั้งหลาย; จากทวัสฏฤบังเกิดม้าศึกผู้ว่องไว—อัศวะอันรวดเร็ว. ทวัสฏฤให้กำเนิดโลกแห่งภพทั้งสิ้นนี้. โอ โหตฤ (Hotṛ) จงบูชาผู้สร้างนั้น ณ ที่นี้ ด้วยแขนของท่านเถิด
Padapatha (Word Analysis)त्वष्टा । वी॒रम् । दे॒व-का॑मम् । जजान । त्वष्टुः । अर्वा॑ । जायत । आ॒शुः । अश्वः । त्वष्टा । इ॒दम् । विश्वम् । भुवनम् । जजान । ब॒होः । क॒र्तारम् । इ॒ह । यक्षि । होतः
Word by Wordत्वष्टाTvaṣṭṛ (the divine artisan) देवकामम्desiring the gods / god-beloved जायतwas born / came to be भुवनम्world/being, the universe बहुःthe many / abundant one यक्षिworship/sacrifice (offer) 
Entities MentionedA
Agni (as the offering-fire, implied)H
Hotṛ (priestly agency, addressed) Viniyoga (Ritual Application)