Codex Vaticanus reference to Cain.
Septuagint (Genesis 4:5) in Codex Vaticanus, accessed July 20, 2021
ἐπὶ δὲ Καιν καὶ ἐπὶ ταῗς θυσίαις αὐτοῦ οὐ προσέσχε[ν] καὶ ἐλύπησε[ν] τὸν Καιν λίαν καὶ συνέπεσε(ν) τῷ προσώπῳ
English text: But Cain and his sacrifices he regarded not. And Cain was exceedingly sorrowful, and his countenance fell.