“The Prophet [Joseph Smith, Jr.] said he could not go; but, after pausing some time, he said he would send some one to heal them; and he turned to me and said: ‘You go with the man and heal his children.’
“He took a red silk handkerchief out of his pocket and gave it to me, and told me to wipe their faces with the handkerchief when I administered to them, and they should be healed. He also said unto me: ‘As long as you will keep that handkerchief, it shall remain a league between you and me.’
“I went with the man, and did as the Prophet commanded me, and the children were healed.
“I have possession of the handkerchief unto this day.”
Wilford Woodruff, Leaves From My Journal, Third Book of the Faith-Promoting Series (Salt Lake City, UT: Juvenile Instructor Office, 1882/second edition), 65.