Śrīmad-Bhāgavatam · Text 11.22.39
Who is speaking and story frame
विषयाभिनिवेशेन नात्मानं यत् स्मरेत् पुन: ।
जन्तोर्वै कस्यचिद्धेतोर्मृत्युरत्यन्तविस्मृति: ॥ ३९ ॥
viṣayābhiniveśena
nātmānaṁ yat smaret punaḥ
jantor vai kasyacid dhetor
mṛtyur atyanta-vismṛtiḥ
When the living entity passes from the present body to the next body, which is created by his own karma, he becomes absorbed in the pleasurable and painful sensations of the new body and completely forgets the experience of the previous body. This total forgetfulness of one’s previous material identity, which comes about for one reason or another, is called death.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.