Atharvaveda 5.11.10

5.11.10

samā́ nau bándhur varuṇa samā́ jā́ védāháṃ tád yán nāv eṣā́ samā́ jā́ |
dádāmi tád yát te ádatto ásmi yújyas te saptápadaḥ sákhāsmi ||10||

Of us two, O Varuṇa, [there is] the same connection, the same birth (jā́).
I know that which is of us two this same birth; I give that which I have not given thee; I am thy suitable comrade of seven steps;—