mā ciraṁ jahi vidviṣam

hata-putrah-who lost his son; tatah-thereafter; tvasta-Tvasta; juhava-performed a sacrifice; indraya-of Indra; satrave-for creating an enemy; indra-satro-O enemy of Indra; vivardhasva-increase; ma-not; ciram-after a long time; jahi-kill; vidvisam-your enemy.