I was reading through this passage in Isaiah 56:
4 For thus saith the LORD concerning the eunuchs that keep My sabbaths, and choose the things that please Me, and hold fast by My covenant. 5 Even unto them will I give in My house and within My walls a monument and a memorial better than sons and daughters; I will give them an everlasting memorial, that shall not be cut off. 6 Also the aliens, that join themselves to the LORD, to minister unto Him, and to love the name of the LORD, to be His servants, every one that keepeth the sabbath from profaning it, and holdeth fast by My covenant.
My question is, are these aliens those who converted to Judaism or are these just the people who worked for the Jewish people in Judah at the time? My understanding is that the Gentiles are not supposed to keep the Sabbath, so this must be one or the other.
What does the Rabbinic teaching on this say about who these aliens are?