Srimad Bhagavatam Canto 01, Chapter 07, Text 56

SB 1.7.56

vimucya rasana-baddham
bala-hatya-hata-prabham
tejasa manina hinam
sibiran nirayapayat
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
He [Asvatthama] had already lost his bodily luster due to infanticide, and now, moreover, having lost the jewel from his head, he lost even more strength. Thus he was unbound and driven out of the camp.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Thus being insulted, the humiliated Asvatthama was simultaneously killed and not killed by the intelligence of Lord Krsna and Arjuna.
 
Srimad Bhagavatam Canto 01, Chapter 07, Text 55
Srimad Bhagavatam Canto 01, Chapter 07, Text 57