Mantrabrahmana 1.6.13

1.6.13

vratānām vrata-pate vratam cariṣyāmi
tat te pra-bravīmi
tat śakeyam tena ṛdhyāsam /
idam aham an-ṛtāt satyam upa-emi // svāhā //

O lord of sacred observances among observances, I will perform a sacred observance;
that I proclaim to you;
may I be capable of it, may I prosper by it.
Here I go from falsehood to truth. Svāhā!