One verse

Srimad Bhagavatam 10.26.17

10.26.17

प्रागयं वसुदेवस्य क्‍वचिज्जातस्तवात्मज: । वासुदेव इति श्रीमानभिज्ञा: सम्प्रचक्षते ॥ १७ ॥

prāgayaṁ vasudevasya kvacij jātas tavātmajaḥ vāsudeva iti śrīmān abhijñāḥ sampracakṣate

prāk
before
ayam
this child
vasudevasya
of Vasudeva
kvacit
sometimes
jātaḥ
was born
tava
your
ātmajaḥ
Kṛṣṇa, who has taken birth as your child
vāsudevaḥ
therefore He may be given the name Vāsudeva
iti
thus
śrīmān
very beautiful
abhijñāḥ
those who are learned
sampracakṣate
also say that Kṛṣṇa is Vāsudeva

For many reasons, this beautiful son of yours sometimes appeared previously as the son of Vasudeva. Therefore, those who are learned sometimes call this child Vāsudeva.