One verse

Srimad Bhagavatam 10.12.37

10.12.37

एतत् कौमारजं कर्म हरेरात्माहिमोक्षणम् । मृत्यो: पौगण्डके बाला द‍ृष्ट्वोचुर्विस्मिता व्रजे ॥ ३७ ॥

etat kaumārajaṁ karma harer ātmāhi-mokṣaṇam mṛtyoḥ paugaṇḍake bālā dṛṣṭvocur vismitā vraje

etat
this incident of delivering both Aghāsura and Kṛṣṇa’s associates from death
kaumāra-jam karma
performed during their kaumāra age (the age of five years)
hareḥ
of the Supreme Personality of Godhead
ātma
the devotees are the Lord’s heart and soul
ahi-mokṣaṇam
their deliverance and the deliverance of the python
mṛtyoḥ
from the path of repeated birth and death
paugaṇḍake
at the age of paugaṇḍa, beginning with the sixth year (one year later)
bālāḥ
all the boys
dṛṣṭvā ūcuḥ
disclosed the fact after one year
vismitāḥ
as if it had happened on that very day
vraje
in Vṛndāvana

This incident of Kṛṣṇa’s saving Himself and His associates from death and of giving deliverance to Aghāsura, who had assumed the form of a python, took place when Kṛṣṇa was five years old. It was disclosed in Vrajabhūmi after one year, as if it had taken place on that very day.