Matthew Henry on Nehemiah 13:23–end
We have here one instance more of Nehemiah's pious zeal for the purifying of his countrymen as a peculiar people to God; that was the thing he aimed at in the use of his power, not the enriching of himself. See here,
I. How they had corrupted themselves by marrying strange wives. This was complained of in Ezra's time, and much done towards a reformation, Ezr 9:1-15 and 10. But, when the unclean spirit is cast out, if a watchful eye be not kept upon him, he will re-enter; so he did here. Though in Ezra's time those that had married strange wives were forced to put them away, which could not but occasion trouble and confusion in families, yet others would not take warning. Nitimur in vetitum -…
Read the whole note in the consoleJamieson-Fausset-Brown on Nehemiah 13:25
cursed them--that is, pronounced on them an anathema which entailed excommunication.
smote . . . and plucked off their hair--To cut off the hair of offenders seems to be a punishment rather disgraceful than severe; yet it is supposed that pain was added to disgrace, and that they tore off the hair with violence as if they were plucking a bird alive.
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Adam Clarke on Nehemiah 13:29
Because they have defiled the priesthood - God, therefore, will remember their iniquities against them, and punish them for their transgressions. These words of Nehemiah are to be understood declaratively.
John Gill on Nehemiah 13:29
Remember them, O my God,.... The priests, and punish them: because they have defiled the priesthood; by marrying strange wives, and rendering themselves unfit to officiate in it:
and the covenant of the priesthood, and of the Levites; made with Levi, Aaron, and Phinehas, see Numbers 24:11, of the corruption of which, complaint is made, Malachi 2:4.
Keil & Delitzsch on Nehemiah 13:28-29
Nehemiah acted with greater severity towards one of the sons of Joiada the high priest, and son-in-law of Sanballat. He drove him from him (מעלי, that he might not be a burden to me). The reason for this is not expressly stated, but is involved in the fact that he was son-in-law to Sanballat, i.e., had married a daughter of Sanballat the Horonite (Neh 2:10), who was so hostile to Nehemiah and to the Jewish community in general, and would not comply with the demand of Nehemiah that he should dismiss this wife. In this case, Nehemiah was obliged to interfere with authority. For this marriage was a pollution of the priesthood, and a breach of the covenant of the priesthood and the Levites. Henc…