de bello gallico, 6.17

They worship as the god Mercury in particular, and there are very many images of this one, and they consider him the inventor of all arts, the guide of their journeys and marches, and (they consider) this one to have the greatest power for the gain of money and trades. After this one (they worship) Apollo, and Mars, and Jupiter, and Minerva. About these they have generally the same belief as remaining nations: (that) Apollo averts diseases, Minerva hands down the beginnings of works and trades, Jupiter holds the command of the heavenly beings, Mars rules wars. To this one, when they have decided to strive in battle, they commonly vow those things which they will take in war: which will have survived, they sacrifice the captured animals, and collect the remaining things into one place. In many states one may see piles of these things heaped in consecrated places; nor does it often happen that any one, with sanctity having been disregarded, dares either to hide in his house things captured or take away things deposited, and the most severe punishment for this matter, with torture, has been established.