Valmiki Ramayana Bala Kanda Sarga 64 Shloka 19

मे for me, तपसा by austerities, आर्जितम् earned, ब्राह्मण्यम् brahminhood, यावत् until, प्रप्तम् is obtained, तावत् till then, अनुच्छवसन् suspending my breath, अभुञ्जान: abstaining from food, शाश्वती: समा: for innumerable years, तिष्ठेयम् I shall stay, तप्यमानसय while performing austerities, मे my, मूर्तय: limbs, क्षयम् deterioration, न यास्यन्ति will not get.

Until brahminhood is obtained by my austerities, I shall stay without breathing or eating for innumerable years. While performing penance, my limbs shall not undergo deterioration".