04 February - Oldest known copies of the Bible, "The Codex Sinaiticus" (Sinai Bible), was seen in Egypt in 1859

 

The Codex Sinaiticus is indeed one of the most important biblical manuscripts, but there is a correction to the information you provided. The Codex Sinaiticus was not seen in Egypt on 04 February 1859. Instead, it was discovered by German biblical scholar Constantin von Tischendorf at the Monastery of St. Catherine on Mount Sinai in Egypt.

Constantin von Tischendorf made several visits to the monastery, and during his third visit in 1859, he discovered a substantial part of the Codex Sinaiticus in a basket of manuscripts that were going to be used as fuel. Tischendorf negotiated with the monks to take the manuscripts to study and publish them. The discovery of the Codex Sinaiticus, which includes a large portion of the Old and New Testaments, has been significant for biblical scholarship.

So, 04 February 1859, is an important date in the history of the Codex Sinaiticus, marking the day when Tischendorf found a substantial part of the manuscript at the St. Catherine's Monastery.