Atharva Veda 2.35: Expiation for an imperfectly performed sacrifice

We who enjoying it have grown no richer, for whom the sacred altar-fires have sorrowed, We who compounded with deficient worship,—may Visvakarman make our service prosper.

Rishis have called the sacrifice's patron amerced through sin, sorrowing for his offspring.
Those drops of meath whereof the missed enjoyment,—may Visvakarman with those drops unite us.

Regarding niggard churls as Soma-drinkers, skilful in sacrifice, weak at the meeting, Whatever sin the captive hath committed, do thou for weal release him, Visvakarman!

Awful are Rishis: unto them be homage, and to their eye and truthfulness of spirit!
Loud homage to Brihaspati, O mighty! Homage to thee, O Visvakarman! Guard us.

The eye of sacrifice, source, and beginning—with voice, ear, spirit unto him I offer.
To this our sacrifice wrought by Visvakarman may the Gods come gracious and kindly-hearted.