One verse

Srimad Bhagavatam 7.10.18

7.10.18

श्रीभगवानुवाच त्रि:सप्तभि: पिता पूत: पितृभि: सह तेऽनघ । यत्साधोऽस्य कुले जातो भवान्वै कुलपावन: ॥ १८ ॥

sri-bhagavan uvaca trih-saptabhih pita putah pitrbhih saha te ’nagha yat sadho ’sya kule jato bhavan vai kula-pavanah

sri-bhagavan uvaca
the Supreme Personality of Godhead said
trih-saptabhih
seven multiplied by three (that is to say, twenty-one)
pita
father
putah
purified
pitrbhih
with your forefathers
saha
all together
te
your
anagha
O most sinless personality (Prahlada Maharaja)
yat
because
sadho
O great saintly person
asya
of this person
kule
in the dynasty
jatah
took birth
bhavan
you
vai
indeed
kula-pavanah
the purifier of the whole dynasty

The Supreme Personality of Godhead said: My dear Prahlada, O most pure, O great saintly person, your father has been purified, along with twenty-one forefathers in your family. Because you were born in this family, the entire dynasty has been purified.