A.T. Robertson Commentary Matthew 7:26

"And every one that heareth these words of mine, and doeth them not, shall be likened unto a foolish man, who built his house upon the sand:" — Matthew 7:26 (ASV)

And doeth them not (κα μη ποιων αυτους). The foolish builder put his house on the sands that could not hold in the storm. One is reminded of the words of Jesus at the beginning of the Sermon in 5:19 about the one "who does and teaches." Hearing sermons is a dangerous business if one does not put them into practice.