Valmiki Ramayana Bala Kanda Sarga 30 Shloka 11

प्रावृषि in the rainy season, निर्गत: originated, मेघ: clouds, यथा like, तथा similarly, गगनम् sky, आवार्य having covered, राक्षसौ two rakshasas, मायाम् illusion, विकुर्वाणौ displaying, अभ्यधावताम् came running.

Like the clouds in the rainy season, the two rakshasas (Maricha and Subahu), covering the sky through their power of illusion, came running (to the sacrificial place).