Revelation 7:4

And I heard the number of them which were sealed: and there were sealed an hundred and forty and four thousand of all the tribes of the children of Israel.

All who are sealed with the Holy Spirit are of spiritual Israel. Paul wrote of the true Jew as the inward Jew, that is, the spiritual Jew, whose ‘circumcision is that of the heart, in the spirit’: “For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh: 29but he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God.” (Romans 2:28,29) Therefore in the sealing of the Holy Spirit, the fleshly Jew and all fleshly differences are ended in Christ. Paul wrote, “For as many of you as have been baptized into Christ have put on Christ. 28 There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus. 29 And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise.” (Galatians 3:27-29)

The number ‘hundred and forty and four thousand’ is symbolic. John was later shown the bride of Christ, the church of God, in the sign of a cube shaped city whose twelve sides were each twelve thousand furlongs in length. The total length of all the sides, twelve times twelve thousand, is hundred and forty-four thousand. (see Revelation 21:15-17) Since the city is symbolic, its dimensions are symbolic. The wall of the city was measured to be an ‘hundred and forty-four cubits’. It was said to be according to ‘the measure of a man, that is, of the angel’: “And he measured the wall thereof, an hundred and forty and four cubits, according to the measure of a man, that is, of the angel.” (Revelation 21:17) Since it would not make sense to take hundred and forty and four cubits to be the literal measure of a man, we can conclude hundred and forty-four cubits to be symbolic of the spiritual measure of a man, that is, of the angel; the angel being the Holy Spirit.

Since an ‘hundred and forty and four cubits’ is symbolic of the spiritual measure of a man who is sealed with the Holy Spirit, a hundred and forty-four thousand is symbolic of the spiritual measure of the servants of Christ who will be sealed with the Holy Spirit.