Which of them it was (το τις αρα ειη εξ αυτων). Note the article το with the indirect question as in verses Luke 22:2; Luke 22:4. The optative ειη here is changed from the present active indicative εστιν, though it was not always done, for see δοκε in verse Luke 22:24 where the present indicative is retained. They all had their hands on the table. Whose hand was it?