One verse

Srimad Bhagavatam 8.16.60

8.16.60

अयं वै सर्वयज्ञाख्य: सर्वव्रतमिति स्मृतम् । तप:सारमिदं भद्रे दानं चेश्वरतर्पणम् ॥ ६० ॥

ayam vai sarva-yajnakhyah sarva-vratam iti smrtam tapah-saram idam bhadre danam cesvara-tarpanam

ayam
this
vai
indeed
sarva-yajna
all kinds of religious rituals and sacrifices
akhyah
called
sarva-vratam
all religious ceremonies
iti
thus
smrtam
understood
tapah-saram
the essence of all austerities
idam
this
bhadre
O good lady
danam
acts of charity
ca
and
isvara
the Supreme Personality of Godhead
tarpanam
the process of pleasing.

This payo-vrata is also known as sarva-yajna. In other words, by performing this sacrifice one can perform all other sacrifices automatically. This is also acknowledged to be the best of all ritualistic ceremonies. O gentle lady, it is the essence of all austerities, and it is the process of giving charity and pleasing the supreme controller.