By the honor of the One whose word is His bond.
In the appellation of the Sovereign of solemn vows.
Under the aegis of the Keeper of sacred pledges.
Invoking the name of the Guarantor of eternal troths.
With reverence to the Architect of unbreakable oaths.
In deference to the Sentinel of everlasting compacts.
By the decree of the One whose assurances are immutable.
In the esteem of the Custodian of the inviolable promise.
Under the patronage of the Authority on steadfast affirmations.
In the tribute to the One whose declarations are sacrosanct.


Here are some more suggestion that could be used as well:
In the name of the Arbiter whose assurances are as firm as the mountains.
By the grace of the One whose edicts are written in the stars.
In the honor of the Sovereign whose word stands unassailable through ages.
Under the banner of the One whose declarations are as perennial as the river’s flow.
With the blessing of the Entity whose promises are as steadfast as the dawn.
In the esteem of the One whose pledges are as boundless as the horizon.
By the word of the One whose oaths are as deep as the ocean.
In the trust of the One whose vows are as unchanging as the desert sands.
Under the watch of the One whose bonds are as eternal as the night sky.
In the reverence of the One whose commitments are as resolute as the tides.