The parallelism of this verse is marked by the peculiarity of dividing between the two members what belongs to the sentence as one whole. Instead of saying that the people would fall (literally, stumble) in the day, and the prophet with them in the night, the meaning of the sentence, divested of its peculiar form of parallelism, is that people and prophet alike would fall together, at all times, both by day and by night, that is to say, there would be no time free from the coming calamities; and there would be no possibility of escape, either for the sinful people or their unfaithful priests; the darkness of the night would not hide them, the light of the day would not aid them; destruction was the doom of priests and people, inevitable and at all times.
And I will destroy thy mother. Their mother was the whole nation as such—the kingdom of Israel. The expression is somewhat contemptuous, as though he said of the individual members that they were truly their mother's children—resembling her erewhile in sin and soon in sorrow.