avadhyaḥ - not to be killed; ayam - he; mama - by Me; api - indeed; eṣaḥ - this; vairocani-sutaḥ - son of Vairocani (Bali); asuraḥ - demon; prahrādāya - to Prahlāda; varaḥ - the benediction; dattaḥ - given; na vadhyaḥ - not to be killed; me - by Me; tava - your; anvayaḥ - descendants.

I will not kill this demonic son of Vairocani, for I gave Prahlāda Mahārāja the benediction that I would not kill any of his descendants.