Which of them it was (to tis ara eiē ex autōn). Note the article to with the indirect question as in Luk 22:2, Luk 22:4. The optative eiē here is changed from the present active indicative estin, though it was not always done, for see dokei in Luk 22:24 where the present indicative is retained. They all had their hands on the table. Whose hand was it?