A.T. Robertson Commentary Luke 22:23

"And they began to question among themselves, which of them it was that should do this thing." — Luke 22:23 (ASV)

Which of them it was (το τις αρα ειη εξ αυτων). Note the article το with the indirect question as in verses 2,4. The optative ειη here is changed from the present active indicative εστιν, though it was not always done, for see δοκε in verse 24 where the present indicative is retained. They all had their hands on the table. Whose hand was it?