Thus says the Lord: Maintain justice, and do what is right, for soon my salvation will come, and my deliverance be revealed. Happy is the mortal who does this, the one who holds it fast, who keeps the sabbath, not profaning it, and refrains from doing any evil. Do not let the foreigner joined to the Lord say, "The Lord will surely separate me from his people"; and do not let the eunuch say, "I am just a dry tree." For thus says the Lord: To the eunuchs who keep my sabbaths, who choose the things that please me and hold fast my covenant, I will give, in my house and within my walls, a monument and a name better than sons and daughters; I will give them an everlasting name that shall not be cut off. And the foreigners who join themselves to the Lord, to minister to him, to love the name of the Lord, and to be his servants, all who keep the sabbath, and do not profane it, and hold fast my covenant—these I will bring to my holy mountain, and make them joyful in my house of prayer; their burnt offerings and their sacrifices will be accepted on my altar; for my house shall be called a house of prayer for all peoples. (NRSV 56:1-7)
Thus saith the Lord, Keep ye judgment, and do justice: for my salvation is near to come, and my righteousness to be revealed. Blessed is the man that doeth this, and the son of man that layeth hold on it; that keepeth the sabbath from polluting it, and keepeth his hand from doing any evil. Neither let the son of the stranger, that hath joined himself to the Lord, speak, saying, The Lord hath utterly separated me from his people: neither let the eunuch say, Behold, I am a dry tree. For thus saith the Lord unto the eunuchs that keep my sabbaths, and choose the things that please me, and take hold of my covenant; Even unto them will I give in mine house and within my walls a place and a name better than of sons and of daughters: I will give them an everlasting name, that shall not be cut off. Also the sons of the stranger, that join themselves to the Lord, to serve him, and to love the name of the Lord, to be his servants, every one that keepeth the sabbath from polluting it, and taketh hold of my covenant; Even them will I bring to my holy mountain, and make them joyful in my house of prayer: their burnt offerings and their sacrifices shall be accepted upon mine altar; for mine house shall be called an house of prayer for all people. (KJV 56:1-7)
Not only the members of Israel and Judah, but also foreigners and eunuchs, have the opportunity to show their loyalty to God. More people are getting brought into the covenant. They all have the opportunity to do the acts of justice and mercy that not only win God's favor but also express loyalty towards him.