SB 7.10.36

punaś ca vipra-śāpena
 rākṣasau tau babhūvatuḥ
kumbhakarṇa-daśa-grīvau
 hatau tau rāma-vikramaiḥ
Word for word: 
punaḥ — again; ca — also; vipra-śāpena — being cursed by the brāhmaṇas; rākṣasau — the two Rākṣasas; tau — both of them; babhūvatuḥ — incarnated as; kumbhakarṇa-daśa-grīvau — known as Kumbhakarṇa and the ten-headed Rāvaṇa (in their next birth); hatau — they also were killed; tau — both of them; rāma-vikramaiḥ — by the extraordinary strength of Lord Rāmacandra.
Translation: 
Being cursed by the brāhmaṇas, the same two associates took birth again as Kumbhakarṇa and the ten-headed Rāvaṇa. These two Rākṣasas were killed by Lord Rāmacandra’s extraordinary power.