Śrīmad-Bhāgavatam · Text 7.14.36
Who is speaking and story frame
जीवराशिभिराकीर्ण अण्डकोशाङ्घ्रिपो महान् ।
तन्मूलत्वादच्युतेज्या सर्वजीवात्मतर्पणम् ॥ ३६ ॥
jīva-rāśibhir ākīrṇa
aṇḍa-kośāṅghripo mahān
tan-mūlatvād acyutejyā
sarva-jīvātma-tarpaṇam
The entire universe, which is full of living entities, is like a tree whose root is the Supreme Personality of Godhead, Acyuta [Kṛṣṇa]. Therefore simply by worshiping Lord Kṛṣṇa one can worship all living entities.
Read Śrīla Prabhupāda's purport on Vedabase.io