SB 10.88.22
	tac chrutva bhagavan rudro
	 durmana iva bharata
	om iti prahasams tasmai
	 dade ’her amrtam yatha
	Translation: 
	Upon hearing this, Lord Rudra seemed somewhat disturbed. Nonetheless, O descendant of Bharata, he vibrated om to signify his assent, granting Vrka the benediction with an ironic smile, as if giving milk to a poisonous snake.