at the sound of the galloping hooves of stallions, the rumbling of chariots, and the clatter of their wheels. The fathers will not turn back for their sons; their hands will hang limp.
KJV
At the noise of the stamping of the hoofs of his strong [horses], at the rushing of his chariots, [and at] the rumbling of his wheels, the fathers shall not look back to [their] children for feebleness of hands;
ASV
At the noise of the stamping of the hoofs of his strong ones, at the rushing of his chariots, at the rumbling of his wheels, the fathers look not back to their children for feebleness of hands;