Yes we find this out in noragsmi aragoto episode 13( last episode)
Watch Noragami Episode 3 English Subbed | Watch Anime Episodes Subbed Dubbed Streaming Online - AnimesVideo.com
Noragami ~~ Yato giving up a piece of his lifeforce for Yukine :: Episode 2
noragami | Noragami episode 9 | Otaku Daydreams
Noragami ~~ Stuffing their faces :: Yato and Yukine in episode 3
Noragami (2014) A minor god seeking to gain widespread worship teams up with a human girl he saved to gain fame, recognition and at least one shrine dedicated to him.
Noragami Episode #07 Anime Review
Spoilers] Noragami Episode 09 Discussion : anime