Valmiki Ramayana 5.40.10

धारयिष्यामि मासं तु जीवितं शत्रुसूदन ।मासादूर्ध्वं न जीविष्ये त्वया हीना नृपात्मज॥

dhārayiṣyāmi māsaṃ tu jīvitaṃ śatrusūdana |māsādūrdhvaṃ na jīviṣye tvayā hīnā nṛpātmaja ||

Our plain-language meaning of this verse is waiting for scholar review.