Rishi: Vasiṣṭha (traditional attribution for RV 5.11, Vasiṣṭha-gotra; exact rishi for each verse follows the sūkta attribution)
Devata: Agni (with allied mention of Indra and the Devāḥ as cooperative powers)
Chandas: Triṣṭubh (11-syllable pādas; typical for many Agni hymns in Mandala 5)
Samhita Patha (Devanagari)यज्ञस्य केतुं प्रथमं पुरोहितमग्निं नरस्त्रिषधस्थे समीधिरे । इन्द्रेण देवैः सरथं स बर्हिषि सीदन्नि होता यजथाय सुक्रतुः ॥
Recitation with translationRig Veda 5.11.2
Transliterationyajñásya ketúṃ prathamáṃ puróhitam agníṃ náras tri-sadhásthe sam-īdhire | índreṇa deváiḥ saráthaṃ sá bárhiṣi sī́dann ní hotā́ yajáthāya su-krátuḥ ||
Translationयज्ञस्य केतुं प्रथमं पुरोहितम् अग्निं नरास्त्रिषधस्थे समिधिरे। इन्द्रेण देवैः सरथं स बर्हिषि सीदन्नि होता यजथाय शुक्रतुः॥
Word by Wordकेतुम्banner; sign; emblem पुरोहितम्the household priest; officiant त्रिषधस्थेin the three-seated place; on the triple seat समीधिरेthey kindled; they have kindled सरथम्on the same chariot; together बर्हिषिon the sacred grass (barhis) सीदन्sitting down; taking his seat होताthe Hotṛ-priest; invoker यजथायfor worship; for the rite सुक्रतुःof good resolve; wise in ritual 
