6:11 And there was given to each of them a white robe; and they were told that they should rest for a little while longer, until the number of their fellow servants and their brethren who were to be killed even as they had been, should be completed also.

And there was given to each of them a white robe;

The white robes are symbolic of their righteous deeds and imputed righteousness by their faith in Christ. We see these souls again in Revelation 7:9. Here they are given their robes; in chapter 7, they are standing around the throne in their white robes giving honor and praise to the One whose blood 'washed their robes', Revelation 7:14.

From physics, white light is the combination of all the colors of light; in a sense, white denotes all radiated energy. This indicates that heaven, since white is the prevalent color, may be a very large concentration of energy. We also know that when material is in close proximity to a source of energy that some of that energy is gained by the material. An example of this is heating a rod of iron; the longer it stays in "the fire" the "whiter" it glows.

So, too, after Moses came back to earth after talking with God, he had to place a veil over his face to not frighten the people, Exodus 34:29-35. When Christ was transfigured before the three disciples, Mark 9:2-8, Christ's garments became radiant and "exceedingly white". Everyone who has had a glimpse of the radiance and majesty comes away TOTALLY changed (2 Peter 1:16-18). Are you looking forward to an encounter like this?

and they were told that they should rest a little while longer,

What is time to an eternal God? So a little while longer may be a long time for us.

UNTIL - the number of

should be completed also.

Everything has a time and place in God's timetable. And the recompensing of deeds, 2 Corinthians 5:1-10, whether good or bad WILL take place!