So practice and observe everything they tell you. But do not do what they do, for they do not practice what they preach.
All therefore whatsoever they bid you observe,.... This must be restrained to things that were agreeable to the chair of Moses, in which they sat, to the law of Moses, which they read and explained, to other parts of Scripture and truth in general; for otherwise many of their glosses and traditions were repugnant to the law, and ought not to be observed, as appears from Mat 5:1.
Verse 3. All therefore whatsoever, etc, That is, all that they teach consistent with the law of Moses; all the commands of Moses which they read to you and properly explain. The word all could not be taken without such a restriction, for Christ himself accuses them of teaching many things contrary to that law, and of making it void by traditions, . They say, and do not.
All therefore--that is, all which, as sitting in that seat and teaching out of that law. they bid you observe, that observe and do--The word "therefore" is thus, it will be seen, of great importance, as limiting those injunctions which He would have them obey to what they fetched from the law itself.