Who am I?

"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.’
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.
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!"