Ramayana
ततस्तु देवसैन्येन राक्षसानां बृहद्बलम् । दशांशं स्थापितं युद्धे शेषं नीतं यमक्षयम् ॥ 7-29-2 ॥
Then by the army of the gods a tenth part of the rakshasas' vast host was held in check in the battle, while the remainder was sent to the abode of Yama.
english translation