Revelation 7:14 in the King James Version
And I said unto him, Sir, thou knowest. And he said to me, These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb.
Context
13 One of the elders answered, saying to me, “These who are arrayed in the white robes, who are they, and where did they come from?”
14 I told him, “My lord, you know.” He said to me, “These are those who came out of the great suffering. They washed their robes and made them white in the Lamb’s blood.
15 Therefore they are before the throne of God, and they serve him day and night in his temple. He who sits on the throne will spread his tabernacle over them.