One verse

Srimad Bhagavatam 12.13.16

12.13.16

निम्नगानां यथा गङ्गा देवानामच्युतो यथा । वैष्णवानां यथा शम्भु: पुराणानामिदं तथा ॥ १६ ॥

nimna-gānāṁ yathā gaṅgā devānām acyuto yathā vaiṣṇavānāṁ yathā śambhuḥ purāṇānām idam tathā

nimna-gānām
of rivers flowing down to the sea
yathā
as
gaṅgā
the Ganges
devānām
of all deities
acyutaḥ
the infallible Supreme Personality of Godhead
yathā
as
vaiṣṇavānām
of devotees of Lord Viṣṇu
yathā
as
śambhuḥ
Śiva
purāṇānām
of Purāṇas
idam
this
tathā
similarly

Just as the Gaṅgā is the greatest of all rivers, Lord Acyuta the supreme among deities and Lord Śambhu [Śiva] the greatest of Vaiṣṇavas, so Śrīmad-Bhāgavatam is the greatest of all Purāṇas.