Atharva Veda 1.3: A charm against constipation and suppression of urine

We know the father of the shaft, Parjanya strong with hundred powers: By this may I bring health unto thy body: let the channels pour their burthen freely as of old.

We know the father of the shaft, Mitra, the Lord of hundred powers: By this, etc.

We know the father of the shaft, Varuna, strong with hundred powers: By this, etc.

We know the father of the shaft, the Moon endowed with hundred powers: By this, etc.

We know the father of the shaft, the Sun endowed with hundred powers: By this may I bring health unto thy body: let the channels pour their burthen freely as of old.

Whate'er hath gathered, as it flowed, in bowels, bladder, or in groins, Thus let the conduit, free from check, pour all its burthen as of old.

I lay the passage open as one cleaves the dam that bars the lake: Thus let, etc.

Now hath the portal been unclosed as, of the sea that holds the flood: Thus let, etc.

Even as the arrow flies away when loosened from the archer's bow, Thus let the burthen be discharged from channels that are checked no more.