Adam Clarke on Matthew 15:7

Hypocrites, well did Isaiah prophesy of you - In every place where the proper names of the Old Testament occur, in the New, the same mode of orthography should be followed: I therefore write Isaiah with the Hebrew, not Esaias, with the Greek. This prophecy is found Isa 29:13. Our blessed Lord unmasks these hypocrites; and we may observe that, when a hypocrite is found out, he should be exposed to all; this may lead to his salvation: if he be permitted to retain his falsely acquired character, how can he escape perdition!