Neither let the son of the foreigner, that {d} 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.

(d) Let no one think himself unfit to receive the graces of the Lord: for the Lord will take away all impediments, and will forsake no one who will keep his true religion, and believe in him.

Wesley's Notes

56:3 The stranger - The stranger, the Gentile, who by birth is a stranger to God, that hath turned from dumb idols to the living God. The eunuch - Who is here joined with the stranger, because he was forbidden to enter into the congregation of the Lord, Deut 23:1. Under these two instances he understands all those, who either by birth, or by any ceremonial pollution, were excluded from church privileges, and so he throws open the door to all true believers. A dry tree - A fruitless tree, accursed by God with the curse of barrenness.

Jamieson-Fausset-Brown Bible Commentary

3. God welcomes all believers, without distinction of persons, under the new economy (Ac 10:34, 35).

joined . to . Lord-(Nu 18:4, 7). "Proselytes."

separated-Proselytes from the Gentiles were not admitted to the same privileges as native Israelites. This barrier between Jews and Gentiles was to be broken down (Eph 2:14-16).

eunuch-(Ac 8:27, &c.). Eunuchs were chamberlains over harems, or court ministers in general.

dry tree-barren (compare Lu 23:31); not admissible into the congregation of Israel (De 23:1-3). Under the Gospel the eunuch and stranger should be released from religious and civil disabilities.

Matthew Henry's Concise Commentary

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.