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Kitto's Popular Cyclopedia of Biblial Literature
Al´pha (Α ), the first letter of the Greek alphabet, corresponding to the Hebrew Aleph. Both the Hebrews and the Greeks employed the letters of their alphabets as numerals, and A (Alpha or Aleph)therefore denoted one or the first. Hence our Lord says of himself, that he is Alpha and Omega, i.e.the first and the last, the beginning and the ending, as he himself explains it (Revelation 1:8; Revelation 1:11; Revelation 21:6; Revelation 22:13).
Kitto, John, ed. Entry for 'Alpha'. "Kitto's Popular Cyclopedia of Biblial Literature". https://www.studylight.org/encyclopedias/eng/kbe/a/alpha.html.