Albert Barnes on Matthew 19:10

His disciples say, etc. The disciples were full of Jewish notions. They thought that the privilege of divorcing a wife when there was a quarrelsome disposition, or anything else that rendered the marriage unhappy, was a great privilege; and that in such cases to be always bound to live with a wife was a great calamity. They said, therefore, that if such was the case in such the condition on which men married--it was better not to marry.

(g) "to marry" Provo 19:13, 31:9,19