Ezekiel 1:9 - Matthew Poole's English Annotations on the Holy Bible

Their wings were joined one to another; the wings of the living creatures, when stretched out to fly, were joined together; so the wings of those two cherubims which went foremost, and the wings of the two hindermost, were joined together when they moved. It seems to refer to that Exodus 25:20. It signifies, however, the equal and uniform readiness of angels, their concord and union with constancy to do the will of God, and it shows us the exact harmony that is between the works of God. These wings, and their being joined, is expressed, Heb. by the union of loving sisters with each other. They turned not when they went; they lost no time in a difficult or tedious turning, as we see in other chariots, for which way soever they were to go, thither they had faces directed, and so readily moved forward on their way, whether east or west, north or south, and held on till they had finished their course, but then were ready for further action, and returned as quick to their station, where they might receive new commands, as lightning does; so this and that Ezekiel 1:14, there they did return, here they did not, are reconciled. They went every one straight forward: this explains the former, and confirms it to us, assuring us that every one of those living creatures are ready, faithful, and unwearied in doing the pleasure of their Creator, in his government of the world. See Ezekiel 1:12.