till. The particle an, with the Subjunctive Mood, gives this a hypothetical force. Compare the four "tills" (Mat_10:23; Mat_16:28; Mat_23:39; Mat_24:34; Mat_26:29).
see = may have seen. App-133. See notes on "an" above and below. Greek. eidon.App-133.
coming, &c. The promise of this coming was definitely repeated later, in Act_3:19-26, and was conditional on the repentance of the nation. Hence the particle "an", which (though untranslatable) expresses the condition or hypothesis implied. Their continuing to live until Act_28:25, Act_28:26 was certain; but the fulfillment of the condition was uncertain. No "an"after "until" in Mat_17:9.