3 “Don’t let foreigners who commit themselves to the Lord say,
    ‘The Lord will never let me be part of his people.’
And don’t let the eunuchs say,
    ‘I’m a dried-up tree with no children and no future.’
4 For this is what the Lord says:
I will bless those eunuchs
    who keep my Sabbath days holy
and who choose to do what pleases me
    and commit their lives to me.
5 I will give them—within the walls of my house—
    a memorial and a name
    far greater than sons and daughters could give.
For the name I give them is an everlasting one.
    It will never disappear!

6 “I will also bless the foreigners who commit themselves to the Lord,
    who serve him and love his name,
who worship him and do not desecrate the Sabbath day of rest,
    and who hold fast to my covenant.
7 I will bring them to my holy mountain of Jerusalem
    and will fill them with joy in my house of prayer.
I will accept their burnt offerings and sacrifices,
    because my Temple will be called a house of prayer for all nations.
8 For the Sovereign Lord,
    who brings back the outcasts of Israel, says:
I will bring others, too,
    besides my people Israel.” (New Living Translation).

Israel, and her leaders (9-12) failed to be a light to the Gentiles. But it was always God’s intention that ”other sheep”…”not of this sheep pen” (Jn.10:16; see verse 8b) should be drawn to the Messiah and into His Kingdom.

‘…God did not abandon the Gentiles. The ”outcast” foreigner is accepted (vv.6-8), and the eunuch is welcomed (vv.3-5; Deut.23:1). In Jesus Christ, the wall between Jews and Gentiles is broken down; and any sinner can come to the Saviour and find forgiveness and acceptance (Eph.2).’ Warren Wiersbe: ‘With the Word’, p.487.

One beautiful New Testament example of the fulfilment of this passage is seen in the story of the Ethiopian eunuch (Acts 8:26-40). He was both a foreigner and a eunuch. Also, it was the scroll of Isaiah he was reading when Philip the evangelist met him and led him to Christ. ‘What a harvest was to follow in the vast African continent, a harvest still being reaped today!’ Barry Webb: ‘Isaiah’, p.223.