One verse

Srimad Bhagavatam 9.9.38

9.9.38

अत ऊर्ध्वं स तत्याज स्त्रीसुखं कर्मणाप्रजा: । वसिष्ठस्तदनुज्ञातो मदयन्त्यां प्रजामधात् ॥ ३८ ॥

ata urdhvam sa tatyaja stri-sukham karmanaprajah vasisthas tad-anujnato madayantyam prajam adhat

atah
in this way
urdhvam
in the near future
sah
he, the King
tatyaja
gave up
stri-sukham
the happiness of sexual intercourse
karmana
by destiny
aprajah
remained sonless
vasisthah
the great saint Vasistha
tat-anujnatah
being permitted by the King to beget a son
madayantyam
in the womb of Madayanti, King Saudasa’s wife
prajam
a child
adhat
begot.

After being thus instructed, the King gave up the future happiness of sexual intercourse and by destiny remained sonless. Later, with the King’s permission, the great saint Vasistha begot a child in the womb of Madayanti.