Charles Ellicott Commentary Isaiah 57:4

"Against whom do ye sport yourselves? against whom make ye a wide mouth, and put out the tongue? are ye not children of transgression, a seed of falsehood," — Isaiah 57:4 (ASV)

Against whom do you sport yourselves? —The question, as in Isaiah 37:23, is one of indignant scorn, the implied answer being that the mockers were deriding the servants of Jehovah. (Compare to Wisdom 2), and, in so doing, mocking Jehovah himself. The “wide mouth,” and the “drawn-out tongue,” are the natural symbols of derision.