One verse

Srimad Bhagavatam 11.18.11

11.18.11

यदासौ नियमेऽकल्पो जरया जातवेपथु: । आत्मन्यग्नीन् समारोप्य मच्चित्तोऽग्निं समाविशेत् ॥ ११ ॥

yadāsau niyame ’kalpo jarayā jāta-vepathuḥ ātmany agnīn samāropya mac-citto ’gniṁ samāviśet

yadā
when
asau
the saintly vānaprastha
niyame
in his prescribed duties
akalpaḥ
unable to carry on
jarayā
due to old age
jāta
arisen
vepathuḥ
trembling of the body
ātmani
within his heart
agnīn
the sacrificial fires
samāropya
placing
mat-cittaḥ
his mind fixed in Me
agnim
the fire
samāviśet
should enter

If the vānaprastha is overtaken by old age and because of his trembling body is no longer able to execute his prescribed duties, he should place the sacrificial fire within his heart by meditation. Then, fixing his mind on Me, he should enter into the fire and give up his body.