Sources for the following mantras?

[Martin]

Namaste,

Does anyone know the sources of the following mantras (which vedic scripture are they from):

1. om brahmaya namah

2. om namo Brahma devaya

3. om Brahma devaya namah

kindly tell me the sources of the above mantras

hari om

[Martin]

Namaste,
It is known that every mantra can be found somewhere in the scriptures. Just as an example, the mantra "Om namah Shivaaya" is found in the Yajur veda. In the same way where can i find mention of the following mantras?

1. om brahmaya namah

2. om namo Brahma devaya

3. om Brahma devaya namah

I have tried searching, but with no success, so if any of the learned members can help me, i would be grateful.

Hari Om