Isaiah 56:2

Happy is the man that shall do this. When he calls those persons "happy" who, having embraced this doctrine, devote themselves to walk uprightly, he indirectly leads us to conclude that many will be deaf or disobedient; but, lest their wickedness or indifference should retard the elect, he recommends the exhortation which he has given from the advantage which it yields.

We are not just if we rob God of his time. Sabbath-sanctification is here put for all the duties of the first table, the fruits of our love to God, as justice and judgment are put for all those of the second table, the fruits of our love to our neighbour.

The man - Every man not only Jews but Gentiles, as it is explained in the following verses. The sabbath - The sabbath seems to be put here, as sacrifice is elsewhere, for the whole worship of God.

Blessed is the man that doth this,....

Great encouragement given to strangers that were willing to come under the bonds of the covenant, assuring them of the blessings of the covenant,

A proof that the Sabbath, in the spirit of its obligation, was to be binding under the Gospel (Isa 66:23). That gospel times are referred to is plain, from the blessing not being pronounced on the man who observed the sacrificial ritual of the Jewish law. layeth hold--image from one grasping firmly some precious object which he is afraid of having forcibly snatched from him.

Blessed is the man - Hebrew, ‘The blessings of the man’ (see Psa 1:1). The sense is, ‘happy is the man.’ The word here rendered ‘man’ (אנושׁ 'ĕnôsh) usually denotes a man in humble life or in a subordinate rank, in contradistinction from אישׁ 'ı̂ysh, a man in elevated rank. As the object of the prophet here is particularly to say, that the ‘stranger’ and the ‘eunuch’ would be admitted to these privileges, it is possible that he designedly used a word denoting one in bumble life. The particular blessing to which he refers is specified in Isa 56:7-8. That doeth this - That is, this which the prophet soon specifies - keeping the Sabbath, and abstaining from evil. And the son of man - Another form of expression denoting man. That layeth hold on it - Hebrew, ‘Binds himself fast to it;’ or seizes upon it with strength. That is, he adheres firmly to the purpose, as a man seizes upon a thing with an intention not to let it go. That keepeth the Sabbath from polluting it - Who sacredly observes the day of holy rest which God has appointed. The Sabbath was one of the special rites of the Jewish religion, and one of the most important of their institutions. Its observance entered essentially into the idea of their worship, and was designed to be the standing memorial or sign between God and the Jewish nation Exo 31:13-17. At home, in their own nation, it kept up the constant sense of religion; abroad, when they traveled among strangers, it would serve to remind all of the special nature of their institutions, and be the public evidence that they were the worshippers of Yahweh. Hence, as this served to distinguish them from other people, it comes to be used here to signify the observance of the rites which pertained to the public worship of God; and evidently includes whatever was to be perpetual and unchanging in the public worship of the Creator. […]