This is the first richa ऋचा (couplet) of the Rigveda.
ॐ अग्निमीळे पुरोहितं यज्ञस्य देवमृत्विजम् । होतारं रत्नधातमम् ।।
agnimILe purohitaM yajñasya devamRtvijam | hotAraM ratnadhAtamam ||
I worship the Fire God, who is the divine priest of the ritual of the sacrifice, who bestows excellence.
‘Agnim’ = fire. ‘Agni‘ here refers to the fire god himself.
ILe = doing prayer
purohitaM = Priest exclusive for family (clan)
yajñasya= The ritual of sacrifice
Rtvijam= Chief priests
hotAraM = Chief priest in leading or presiding role(The hotṛ who recites invocations and litanies of the rigveda.
ratna = excellence, shining brilliance, literal meaning is gems
dhAtamam = who gives, bestows