Ponderantur testes
Defined in 2 dictionaries — Kinney (1893), Stimson (1881)
A Law Dictionary and Glossary
George C. Kinney · 1893
non nnmerantur, I. Witnesses are weighed, not counted; that is, they are estimated by the weight or importance of their testimony, and not by their number.
Glossary of Technical Terms, Phrases, and Maxims of the Common Law
Frederic Jesup Stimson · 1881
non numerantur, /. Witnesses are weighed, not counted.