SB 10.78.36
sri-bhagavan uvaca
atma vai putra utpanna
iti vedanusasanam
tasmad asya bhaved vakta
ayur-indriya-sattva-van
Translation:
The Supreme Lord said: The Vedas instruct us that one’s own self takes birth again as one’s son. Thus let Romaharsana’s son become the speaker of the Puranas, and let him be endowed with long life, strong senses and stamina.
Purport:
Srila Sridhara Svami quotes the following Vedic verse to illustrate the principle enunciated here by Lord Balarama:
angad angat sambhavasi
hrdayad abhijayase
atma vai putra-namasi
sañjiva saradah satam
“You have taken birth from my various limbs and have arisen from my very heart. You are my own self in the form of my son. May you live through a hundred autumns.” This verse appears in the Satapatha Brahmana (14.9.8.4) and the Brhad-aranyaka Upanisad (6.4.8).