False yourself!
The reading is based in Torah.
Every sabbath, on a yearly repeating cycle according to Jewish Tradition, which Jesus observed according to the scriptures, Jews read a Torah portion (first five books of your Bible), and a Haftorah portion (from one of the Prophets, not the Torah). Jesus was called up and read the Haftorah portion (from the Prophet Isaiah).
He thus observed the Jewish tradition for the synagogue service, which like the Catholic Mass, has been observed by the faithful for almost two millennia.