Rig Veda 1.1.8

Rajantamadhvaranam gopam rtasya didivim
vardhamanamsve dame

Meaning of Rigveda 1.1.8 

Bearing gifts of homage with faith and humility, we come to Agni, self-refulgent ruling lord of yajnic acts of love and compassion, protector of the earth and the environment and illuminator of the Divine Word and the universal law, immanently growing with the expansive universe of His own creation.

Mantra in sanskrit

राजन्तमध्वराणां गोपामृतस्य दीदिविम् । वर्धमानं स्वे दमे ॥