Augustine of Hippo — as excerpted in the Catena Aurea on Mark 10:1-12

“(cont. Faust. xix. 26) Moses, however, was against a man’s dismissing his wife, for he interposed this delay, that a person whose mind was bent on separation, might be deterred by the writing of the bill, and desist; particularly, since, as is related, among the Hebrews, no one was allowed to write Hebrew characters but the scribes. The law therefore wished to send him, whom it ordered to give a bill of divorcement, before he dismissed his wife, to them, who ought to be wise interpreters of the law, and just opponents of quarrel. For a bill could only be written for him by men, who by their good advice might overrule him, since his circumstances and necessity had put him into their hands, and so by treating between him and his wife they might persuade them to love and concord. But if a hatred so great had arisen that it could not be extinguished and corrected, then indeed a bill was to be written, that he might not lightly put away her who was the object of his hate, in such a way as to prevent his being recalled to the love, which he owed her by marriage, through the persuasion of the wise. For this reason it is added, For the hardness of your heart, he wrote this precept; for great was the hardness of heart which could not be melted or bent to the taking back and recalling the love of marriage, even by the interposition of a bill in a way which gave room for the just and wise to dissuade them.”