How did those who survived the great tribulation make their robes white?

0 How did those who survived the great tribulation make their robes white?

Whosoever would not seek the LORD God of Israel should be put to death, whether small or great, whether man or woman. 2 Chronicles 15:13

These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb. Revelation 7:14

Send comments to Steve Wells
at swwells(at)gmail.com