(6) Also the sons of the stranger . . .--Proselytes also were to share in the blessings of the wider covenant. The words "to serve him" have been referred to some menial offices like that of the Nethinim, "hewers of wood and drawers of water" (Joshua 9:27; Ezra 8:20). The usage of the word, however, limits it to honourable functions. The germ of Isaiah's thought appears in Solomon's dedication prayer (1Kings 8:41-43). It receives its highest development (in its entire separation from the building with which there and here it is associated), in John 4:23. Comp. a further emancipation from the bondage of the law in Isaiah 66:21.

Verse 6. - Also the sons of the stranger (comp. ver. 3). The proselytes shall not be treated as they fear. On the contrary, God will treat them in exactly the same way as his original people - will conduct them to Palestine, settle them in his "holy mountain," admit them to the temple services, accept their burnt offerings and their sacrifices. All this will be a foretaste of their position in the Christian Church, where there will be neither Jew nor Gentile, neither circumcision nor uncircumcision, but a community where all are brethren and all have equal privileges.

56:3-8 Unbelief often suggests things to discourage believers, against which God has expressly guarded. Spiritual blessings are unspeakably better than having sons and daughters; for children are a care, and may prove a grief and shame, but the blessings we partake of in God's house, are comforts which cannot be made bitter. Those who love the Lord truly, will serve him faithfully, and then his commandments are not grievous. Three things are promised. Assistance: I will not only bid them welcome, but incline them to come. Acceptance, and comfort: though they came mourning to the house of prayer, they shall go away rejoicing. They shall find ease by casting their cares and burdens upon God. Many a sorrowful spirit has been made joyful in the house of prayer. The Gentiles shall be one body with the Jews, that, as Christ says, Joh 10:16, there may be one fold and one Shepherd. Thanks be to God that none are separated from him except by wilful sin and unbelief; and if we come to him, we shall be accepted through the sacrifice of our great High Priest.Also the sons of the stranger that join themselves to the Lord,.... Having answered the objection and removed the discouragement of the eunuch, he now returns to the sons of the stranger, who also join themselves to the Lord, as the eunuch had done; see Isaiah 56:4 and who do this,

to serve him, and to love the name of the Lord, to be his servants; who give up themselves to him, not only to be saved by him, but to serve him in righteousness and holiness, with reverence and godly fear, and from a principle of love to him; being heartily desirous, and accounting it an honour, to be his servants:

everyone that keepeth the sabbath from polluting it, and taketh hold of my covenant; See Gill on Isaiah 56:4.