SB 8.19.6
yam vinirjitya krcchrena
visnuh ksmoddhara agatam
atmanam jayinam mene
tad-viryam bhury anusmaran
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When delivering the earth from the Garbhodaka Sea, Lord Visnu, in His incarnation as a boar, killed Hiranyaksa, who had appeared before Him. The fight was severe, and the Lord killed Hiranyaksa with great difficulty. Later, as the Lord thought about the uncommon prowess of Hiranyaksa, He felt Himself victorious indeed.