One verse

Srimad Bhagavatam 10.20.9

10.20.9

श्रुत्वा पर्जन्यनिनदं मण्डुका: ससृजुर्गिर: । तूष्णीं शयाना: प्राग् यद्वद्ब्राह्मणा नियमात्यये ॥ ९ ॥

śrutvā parjanya-ninadaṁ maṇḍukāḥ sasṛjur giraḥ tūṣṇīṁ śayānāḥ prāg yadvad brāhmaṇā niyamātyaye

śrutvā
hearing
parjanya
of the rain clouds
ninadam
the resounding
maṇḍukāḥ
the frogs
sasṛjuḥ
emitted
giraḥ
their sounds
tūṣṇīm
silently
śayānāḥ
lying
prāk
previously
yadvat
just as
brāhmaṇāḥ
brāhmaṇa students
niyama-atyaye
after finishing their morning duties

The frogs, who had all along been lying silent, suddenly began croaking when they heard the rumbling of the rain clouds, in the same way that brāhmaṇa students, who perform their morning duties in silence begin reciting their lessons when called by their teacher.