 Many corrections have been made to the manuscript , some of them by the original scribe , but the majority of them by later hands . The corrected form of the text agrees with codices D , N , X , Y , Γ , Θ , Π , Σ , Φ and the great majority of the minuscule manuscripts . Kenyon observed that Codex Alexandrinus had been " extensively corrected , though much more in some books than in others " . In the Pentateuch , whole sentences were erased and a new text substituted . Kings was the least corrected of the books . In the Book of Revelation only 1 of its 84 singular readings was corrected . This is in stark contrast with Codex Sinaiticus , in which 120 of the Apocalypse 's 201 singular readings were corrected in the 7th century . 
