Behold, he putteth no trust in his saints - In Job 4:18, it is, “in his servants,” but no doubt the same thing is intended. The reference is to the angels, called there servants, and here saints קדשׁים qôdeshı̂ym, holy ones; see the notes at Job 4:18.
Yea, the heavens are not clean in his sight - In Job 4:18, “and his angels he charged with folly.” The general idea is the same. God is so holy that all things else seem to be impure. The very heavens seem to be unclean when compared with him. We are not to understand this as meaning that the heavens are defiled; that there is sin and corruption there, and that they are loathsome in the sight of God. The object is to set forth the exceeding purity of God, and the greatness of his holiness. This sentiment seemed to be a kind of proverb, or a commonplace in theology among the sages of Arabia. Thus, it occurs in Job 25:5, in the speech of Bildad, when he had nothing to say but to repeat the most common-place moral and theological adages -
Behold even to the moon, and it shineth not;
Yea, the stars are not pure in his sight:
How much less man, that is a worm,
And the son of man, which is a worm!