The “sheep” supported Christ’s “brothers” in their commission to preach the good news and in any ways that gave aid and comfort to them as they were hated and persecuted (John 15:18-21)......the “goats” OTOH did nothing to support Christ’s brothers, ignorant of the fact that it was a requirement for life.
So who are Christ’s “brothers” as opposed to who are the “sheep” who support them?
"Inasmuch as ye have done it unto one of the least of these My brethren, ye have done it unto Me." – Matt. 25:40.
Now this Scripture is a generally misunderstood and misused one. If you haven't studied it in its connections, you'd likely think that the Lord is referring to those who have lived during the Gospel Age. But the context shows that He refers to those living in the Millennial Age. The principle, then, is helpful to us now. Whoever does a kindness for anyone belonging to the Lord is counted by Him as doing it unto Him.
In the past God made a covenant with the nation of Israel alone. All other nations and peoples were outsiders. During this Gospel Age the Lord has made a covenant with the Church, through Christ, a special Covenant of Sacrifice into which you and I, (if you avail yourself of it) are privileged to enter. The opportunity to make this Covenant of Sacrifice has been open throughout the Gospel Age; and all who come to God through that covenant are said to be Israelites indeed. – Gal. 3:8,16,29.
Now verse 40 refers, not to Christians, (only the True Church are considered "Christian") but to Gentiles – the world in general, (remember the Church is no part of this world.) So, before Messiah's Throne shall be gathered all peoples, all nations. "And He shall separate them the one from the other, as a shepherd divideth his sheep from the goats." It's not a class separation, but an individual one. As I stated above, whoever, after trial, demonstrates that he is a goat will go over to the left hand. Whoever proves himself to be a sheep will go to the right. The whole picture refers to the thousand years of the Messianic Reign, the world's judgment, the world's trial. The sole object of that Reign is to prove who will desire to be God's sheep, to come into His fold and have His Son as their Shepherd, and who will not come into harmony with Him, but will have a goat-like nature. Then Christ will deal with them accordingly.
So, the Messiah will be dealing with the world of mankind, the majority of whom are now in the great prison-house of death. The Apostle Paul, in speaking of the resurrection, says that the dead shall come forth "every man in his own order," or company or class. They will not all come forth at once. The Church class will come forth first; then the Great Company class; and early in the new order of things will come forth the Ancient Worthies, who will be the earthly representatives of God's Kingdom. – 1 Cor. 15:21-23.
As Jesus said to some in His day, "Ye shall see Abraham, Isaac, Jacob and all the Prophets in the Kingdom of God." (Luke 13:28.) They will be the human representatives of the Heavenly Kingdom, which will be invisible. Jesus said nothing about their seeing Himself. Neither did He say, "Ye shall see these My disciples in the Kingdom." He did say, however, "Yet a little while, and the world seeth Me no more." John tells us that the Church shall be like her Lord. (1 John 3:2.) If the world will not see Him, they will not see the Church; for the Church will be spirit beings, that cannot be seen.
So, we have these orders: the Little Flock, the Great Company, the Ancient Worthies, and the world of mankind – "every man in his own order." Jesus said, "The hour is coming when all that are in the graves shall hear the voice of the Son of God; and they that hear shall live." (John 5:25-29.) As the world returns from the tomb, the thought is that they will come back in answer to prayer, very much the same as did Lazarus. Remember, Jesus asked, "Where have you laid him?" Then He lifted up His eyes and prayed to the Father, after which He said, "Lazarus, come forth." – John 11:41-44.
The "sheep" class of that Age will be those who will have the Lord's spirit; and as the Lord's purpose will be to bring people back from death, to teach them and to prepare them for eternal life, all the sheep will feel the same way. They'll gladly do this, because they have a love for this work. They'll be feeding, clothing and helping those whom they have gotten out of the prison-house of death. Their prayers will go out continually after those in prison. This explains the whole work of the Millennial Age, and shows how all the people will come into harmony with God.
As oppose to the goat class, who will say, "I don't care about this matter or care for these people." The sheep class will be busy working, working right along; but the goat class will be showing their selfish disposition. God doesn't purpose that any who are selfish shall have everlasting life. Selfishness came in as a result of sin. You and I were born selfish and couldn't help it; but we have better knowledge now. We're beginning to see God's way. All then in true sympathy with God and righteousness will be cultivating love in their hearts.
At the close of the Age the Lord will say to the sheep class, "I was an hungered, and ye gave Me meat; I was thirsty, and ye gave Me drink; I was a stranger, and ye took Me; naked, and ye clothed Me; sick and in prison, and ye visited Me"; for "inasmuch as ye did it unto one of the least of these, ye did it unto Me." You did not know it, but I was watching you. You are on My right hand – in My favor. The Father wishes you to have the Kingdom originally given to Adam but lost through disobedience.
No other class will be given the kingdom. God's not selfish but is always considering what He can do for somebody else. All of His people must have His spirit. All mankind must eventually have the same spirit, or they can't inherit the earthly kingdom. The Heavenly Kingdom is for those of the Church who prove worthy. They will get it because they have the spirit of love; and those of the world who cultivate the Lord's spirit will receive the kingdom prepared for them from the foundation of the world. (Gen. 1:26-28.) Christ's Kingdom was prepared from before the foundation of the world. Mankind's will be an earthly kingdom a Paradise world-wide.