One verse

Srimad Bhagavatam 10.87.43

10.87.43

इत्यशेषसमाम्नायपुराणोपनिषद्रस: । समुद्‍धृत: पूर्वजातैर्व्योमयानैर्महात्मभि: ॥ ४३ ॥

ity aśeṣa-samāmnāya- purāṇopaniṣad-rasaḥ samuddhṛtaḥ pūrva-jātair vyoma-yānair mahātmabhiḥ

iti
thus
aśeṣa
of all
samāmnāya
the Vedas
purāṇa
and Purāṇas
upaniṣat
comprising the confidential mystery
rasaḥ
the nectar
samuddhṛtaḥ
distilled
pūrva
in the distant past
jātaiḥ
by those who were born
vyoma
in the higher regions of the universe
yānaiḥ
who travel
mahā-ātmabhiḥ
saintly persons

Thus the ancient saints who travel in the upper heavens distilled this nectarean and confidential essence of all the Vedas and Purāṇas.