SB 10.63.49
catvaro ’sya bhujah sista
bhavisyaty ajaramarah
parsada-mukhyo bhavato
na kutascid-bhayo ’surah
Translation:
This demon, who still has four arms, will be immune to old age and death, and he will serve as one of your principal attendants. Thus he will have nothing to fear on any account.