SB 7.5.42
prayase ’pahate tasmin
daityendrah parisankitah
cakara tad-vadhopayan
nirbandhena yudhisthira
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
My dear King Yudhisthira, when all the attempts of the demons to kill Prahlada Maharaja were futile, the King of the demons, Hiranyakasipu, being most fearful, began contriving other means to kill him.