The same ceremony should be repeated on the seventh day of the month, not on the first day of the seventh month, as Smend proposes, in accordance with the λήψῃ, and on the ground that "the seventh day of (the same) mouth" would have been in Hebrew בְּשִׁבְעָה לֶחֹדֶשׁ, as in Ezekiel 1:1; Ezekiel 30:20; at the same time admitting that בַּחֹדֶשׁ is sometimes used (Numbers 10:11), though not (except in this verse) by Ezekiel.
The sin offerings in question should be made for (or, on account of, מִן, "away from," expressing the reason why anything is done) every one that erreth, and for him that is simple, i.e. for such transgressors as should have gone aside from the straight path through ignorance or foolishness, the "simple" man being here, as in Proverbs 7:7; Proverbs 22:3; Proverbs 27:12, one easily enticed or persuaded to do evil.
For such offenders the Law of Moses provided means of expiation (Le Proverbs 2:2, etc.; Proverbs 5:15; Numbers 15:27); for the presumptuous sinner, who despised the word of the Lord and violated his commandment, only one doom remained, to be cut off from among his people (Numbers 15:30; Deuteronomy 17:12).