The Old Testament often uses parallel phrases which refer to the same thing for emphasis, but Matthew was evidently not familiar with this usage. (religion.blogs.cnn.com)
If we apply to that the principle of Hebrew parallelism in which the second arm of the two parallel phrases reiterates or explains the first, then we can say that the Kingdom is a society upon earth in which God's will is as perfectly done as it is in heaven. (religion-online.org)
Lest his militancy be misunderstood, Paul parses this summons with the parallel phrase: «Put on the Lord Jesus Christ, and make no provision for the flesh.» (religion-online.org)