Where does the following basic human right find its origin?

innocent until proven guilty

The origins of human rights may be found both in Greek philosophy and the various world religions. In the Age of Enlightenment (18th century) the concept of human rights emerged as an explicit category. Man/woman came to be seen as an autonomous individual, endowed by nature with certain inalienable fundamental rights that could be invoked against a government and should be safeguarded by it. Human rights were henceforth seen as elementary preconditions for an existence worthy of human dignity.

In courts u can't be executed with out prof u killed some one no proof u dint kill anyone in the eyes of the state u kill some one there is a murder weapon they have the right to execute you because they have substantial proof after fingerprints and stuff works out