One verse

Srimad Bhagavatam 3.11.35

3.11.35

पूर्वस्यादौ परार्धस्य ब्राह्मो नाम महानभूत् । कल्पो यत्राभवद्ब्रह्मा शब्दब्रह्मेति यं विदु: ॥ ३५ ॥

purvasyadau parardhasya brahmo nama mahan abhut kalpo yatrabhavad brahma sabda-brahmeti yam viduh

purvasya
of the first half
adau
in the beginning
para-ardhasya
of the superior half
brahmah
Brahma-kalpa
nama
of the name
mahan
very great
abhut
was manifest
kalpah
millennium
yatra
whereupon
abhavat
appeared
brahma
Lord Brahma
sabda-brahma iti
the sounds of the Vedas
yam
which
viduh
they know.

In the beginning of the first half of Brahma’s life, there was a millennium called Brahma-kalpa, wherein Lord Brahma appeared. The birth of the Vedas was simultaneous with Brahma’s birth.