Valmiki Ramayana Yuddha Kanda Sarga 80 Shloka 42

यद्येषः by himself, भूमिम् into earth, विशतेयदिenters also, दिवंवा heaven or, रसातलंवापि underground, नभस्तलंवा subterranean world, एवम् in that way, निगूढोऽपि remains hidden, ममmy, अस्त्रदग्धःweapon, गतासुः consumed, भूमितले on the ground, पतिष्यतेwill fall

"If he enters into earth, heaven or the underground world or the subterranean world or remains hidden, my weapon will consume him, and he will fall on earth."