621. These are the ones who follow the Lamb wherever He goes. This symbolically means that they are conjoined with the Lord through love and through faith in Him, because they lived in accordance with His commandments.

That this is the symbolic meaning is apparent from these words of the Lord:

He who... keeps (My commandments), it is he who loves Me. And... I will love him and... I will come to him and make My abode in him. (John 14:20-23)

And elsewhere:

When (the shepherd of the sheep) brings out his own sheep, he goes before them; and the sheep follow him, for they know his voice... My sheep hear My voice, and I know them, and they follow Me. (John 10:4-5, 27)