It could be referring to the line in Revelation 22:13 - "I am Alpha and Omega, the beginning and the end, the first and the last". So the next part of the sequence could be "t and e" (again), being the first and last letters of "the"?
Sorry, I failed to give details. This is from the Goodworth Clatford Quiz 2021/2022. Closing date is 18 January 2022. Entries can be obtained by making a donation to their Justgiving page: https://www.justgiving.com/fundraising/quiz2021