Valmiki Ramayana 1.42.13

ऊर्ध्व बाहुः पंच तपा मास आहारो जितेइन्द्रियः ।तस्य वर्ष सहस्राणि घोरे तपसि तिष्ठतः॥

ūrdhva bāhuḥ paṃca tapā māsa āhāro jiteindriyaḥ |tasya varṣa sahasrāṇi ghore tapasi tiṣṭhataḥ ||

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