One verse

Srimad Bhagavatam 10.1.45

10.1.45

एषा तवानुजा बाला कृपणा पुत्रिकोपमा । हन्तुं नार्हसि कल्याणीमिमां त्वं दीनवत्सल: ॥ ४५ ॥

eṣā tavānujā bālā kṛpaṇā putrikopamā hantuṁ nārhasi kalyāṇīm imāṁ tvaṁ dīna-vatsalaḥ

eṣā
this
tava
your
anujā
younger sister
bālā
innocent woman
kṛpaṇā
completely dependent on you
putrikā-upamā
exactly like your own daughter
hantum
to kill her
na
not
arhasi
you deserve
kalyāṇīm
who is under your affection
imām
her
tvam
you
dīna-vatsalaḥ
very compassionate to the poor and innocent

As your younger sister, this poor girl Devakī is like your own daughter and deserves to be affectionately maintained. You are merciful, and therefore you should not kill her. Indeed, she deserves your affection.