One verse

Srimad Bhagavatam 7.14.36

7.14.36

जीवराशिभिराकीर्ण अण्डकोशाङ्‌घ्रिपो महान् । तन्मूलत्वादच्युतेज्या सर्वजीवात्मतर्पणम् ॥ ३६ ॥

jiva-rasibhir akirna anda-kosanghripo mahan tan-mulatvad acyutejya sarva-jivatma-tarpanam

jiva-rasibhih
by millions and millions of living entities
akirnah
filled up or spread over
anda-kosa
the whole universe
anghripah
like a tree
mahan
very, very great
tat-mulatvat
because of being the root of this tree
acyuta-ijya
worship of the Supreme Personality of Godhead
sarva
of all
jiva-atma
living entities
tarpanam
satisfaction.

The entire universe, which is full of living entities, is like a tree whose root is the Supreme Personality of Godhead, Acyuta (Krsna). Therefore simply by worshiping Lord Krsna one can worship all living entities.