Chandogya Upanishad 4.16.3

4.16.3

anyatarām eva (S ) saṃskaroti \
hīyate anyatarā \
sa yathā ekapād vrajan ratho vaikena cakreṇa vartamāno riṣyaty evam asya yajño riṣyati \
yajñaṃ riṣyantaṃ yajamāno (S ) \
sa iṣṭvā pāpīyān bhavati \\416.3\

As a one-legged man walking, or a chariot proceeding with one wheel, suffers injury, so his sacrifice suffers injury. The institutor of the sacrifice suffers injury after the sacrifice which suffers injury. He becomes worse off by having sacrificed.

In case, after the morning litany has commenced, the Brahman priest interrupts before the concluding verse, he forms only one path. The other becomes discontinued.