Rishi: Ṛgvedic Aśvamedha tradition (sectional attribution).
Devata: Aśva (as consecrated victim), Vanaspati, Agni, and the Devas collectively.
Chandas: Jagatī/triṣṭubh mixture typical of cited Ṛgvedic material (approximate).
Samhita Patha (Devanagari)अश्वो॑ घृ॒तेन॒ त्मन्या॒ सम॑क्त॒ उप॑ दे॒वाँ२ ऋ॑तु॒शः पाथ॑ एतु । वन॒स्पति॑र्देवलो॒कं प्र॑जा॒नन्न॒ग्निना॑ ह॒व्या स्व॑दि॒तानि॑ वक्षत्
Transliterationáśvo ghṛténa tmanā́ sámakta úpa devā́m̐ r̥tuśáḥ pā́tha etu | vanáspátir devalokáṃ prajānán agnínā havyā́ svaditā́ni vakṣat |
Translationこの馬は、自らの力によりギー(ghṛta)を塗られ、季節にかなう道を通って、神々のもとへ赴け。ヴァナスパティ(Vanaspati)は神々の世界を知り、アグニ(Agni)とともに、香味よく整えられた供物(havis)を彼らへ運べ。
Padapatha (Word Analysis)अश्वः । घृ॒तेन । त्मन्या॒ । सम॑क्तः । उप । दे॒वान् । ऋ॒तु-शः । पाथः । एतु । वन॒स्पतिः । दे॒व-लोकम् । प्र॒जानन् । अ॒ग्निना॑ । ह॒व्या । स्व॑दि॒तानि । वक्षत्
Word by Wordत्मन्याwith (his) self / by his own power ऋतुशःseason by season, in due order वनस्पतिःthe lord of the forest (tree/wood) देवलोकम्the world/realm of the gods प्रजानन्knowing, recognizing अग्निनाwith Agni / by fire स्वदितानिmade sweet/pleasant, well-tasted वक्षत्let (him/it) carry/bring 
Entities MentionedA
Aśva (consecrated horse) Viniyoga (Ritual Application)