Commentaries:
Robertson's Word Pictures (NT)
By what authority (en poiai ecousiai). This question in all three Gospels was a perfectly legitimate one. See on Matthew 21:23-27 for discussion. Note present subjunctive here (ina tauta poihv), that you keep on doing these things.
Other Robertson's Word Pictures (NT) entries containing Mark 11:28:
Matthew 1:22
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