Of the two people who wrote Arabic notes in the margins of Codex Sinaiticus, one (called “Arabic A") made most of his notes (seven of eight) in the pages of Isaiah. Beside Isa 1:10 he wrote "The Prophet rebukes the leaders of Israel”; another note appears at 2:1,10. There are lectionary notes at the end of 5:6, the beginning of 5:7,16, and an illegible note at 5:17.