What is the ruling of Islamic law on one who stipulates definitively established and definitively indicating proof to substantiate Islamic legal rulings, and has anyone among the predecessors or successors held this view?

The statement that Sharia evidence must be definitive in authenticity and meaning is false, because most of the evidence in Sharia is probabilistic in authenticity or meaning. The Companions, the Tabi'un, and the majority of scholars have all agreed on the authoritative nature of isolated reports (khabar al-ahad) and the obligation to act upon them.