(Journal of Discourses, volume 3, page 247)

For more reading on the subject, check out the online book Mountain Meadows Massacre.

For more on the Mormon doctrine of Blood Atonement see:

The Mormon doctrine of Blood Atonement as taught by Brigham Young.

The doctrine of Blood Atonement as taught by the Mormon organization.

Also check out additional LDS quotes and information on Blood Atonement here, here, and here.

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See also What do Mormons think about Islam?