Often, especially in monasteries, a manuscript cache was little more than a former manuscript recycling centre, where imperfect and incomplete copies of manuscripts were stored while the monastery or scriptorium decided what to do with them. There were several options. The first was to simply "wash" the manuscript and reuse it. Such reused manuscripts were called palimpsests and were very common in the ancient world until the Middle Ages. One notable palimpsest is the Archimedes Palimpsest. When washing was no longer an option, the second choice was burning. Since the manuscripts contained the words of Christ, they were thought to have had a level of sanctity; burning them was considered more reverent than simply throwing them into a garbage pit, which occasionally happened (as in the case of Oxyrhynchus 840). The third option was to leave them in what has become known as a manuscript gravesite. When scholars come across manuscript caches, such as at Saint Catherine's Monastery in the Sinai (the source of the Codex Sinaiticus), or Saint Sabbas Monastery outside Bethlehem, they are finding not libraries but storehouses of rejected texts sometimes kept in boxes or back shelves in libraries due to space constraints. The texts were unacceptable because of their scribal errors and contain corrections inside the lines, possibly evidence that monastery scribes compared them to a master text. In addition, texts thought to be complete and correct but that had deteriorated from heavy usage or had missing would also be placed in the caches. Once in a cache, insects and humidity would often contribute to the continued deterioration of the documents.