yatra hi mahāhi-pravara-śiro-maṇayaḥ sarvaṁ tamaḥ prabādhante.

yatra hi mahahi-pravara-siro-manayah sarvam tamah prabadhante.
yatra-where; hi-indeed; maha-ahi-of great serpents; pravara-of the best; sirah-manayah-the gems on the hoods; sarvam-all; tamah-darkness; prabadhante-drive away.
 

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