One verse

Srimad Bhagavatam 7.9.38

7.9.38

इत्थं नृतिर्यगृषिदेवझषावतारै- र्लोकान् विभावयसि हंसि जगत्प्रतीपान् । धर्मं महापुरुष पासि युगानुवृत्तं छन्न: कलौ यदभवस्त्रियुगोऽथ स त्वम् ॥ ३८ ॥

ittham nr-tiryag-rsi-deva-jhasavatarair lokan vibhavayasi hamsi jagat pratipan dharmam maha-purusa pasi yuganuvrttam channah kalau yad abhavas tri-yugo ’tha sa tvam

ittham
in this way
nr
like a human being (such as Lord Krsna and Lord Ramacandra)
tiryak
like animals (such as the boar)
rsi
as a great saint (Parasurama)
deva
as demigods
jhasa
as an aquatic (such as the fish and tortoise)
avataraih
by such different incarnations
lokan
all the different planetary systems
vibhavayasi
You protect
hamsi
You (sometimes) kill
jagat pratipan
persons who have simply created trouble in this world
dharmam
the principles of religion
maha-purusa
O great personality
pasi
You protect
yuga-anuvrttam
according to the different millenniums
channah
covered
kalau
in the Age of Kali
yat
since
abhavah
have been (and will be in the future)
tri-yugah
named Triyuga
atha
therefore
sah
the same personality
tvam
You

In this way, my Lord, You appear in various incarnations as a human being, an animal, a great saint, a demigod, a fish or a tortoise, thus maintaining the entire creation in different planeary systems and killing the demoniac principles. According to the age, O my Lord, You protect the principles of religion. In the age of Kali, however, You do not assert Yourself as the Supreme Personality of Godhead, and therefore You are known as Triyuga, or the Lord who appears in three yugas.