Matthew Poole and continuators on Revelation 12:11

11 And they overcame him by the blood of the Lamb , and by the word of their testimony ; and they loved not their lives unto the death .

Michael and his Angels mentioned, v. 7. overcame the Dragon and his Angels: The Christians overcame the Pagans.

Some translate [non-Latin text not transcribed] here, propter, because of, as denoting the meritorious Cause, which is true; for Christ's Blood was both the meritorious and exemplary Cause of their Victory. But this will not agree with the usage of the term in the next words. Others therefore rather chuse to translate it, by, as denoting the efficient Cause, whether principal, (as was the Blood of the Lamb) or instrumental,

as was their Preaching, and professing the Gospel;

and by their patient bearing the Cross, not shunning the Danger of Death, that they might preach Christ, and own his Truths, and live up to the holy Rule of his Gospel.

Marginal references: Rom. 8.33, 34, 37. & 16.20.