freedom07

I have never heard this before, but since you inquired I did a little research and came up with this.

King Manasseh is reported to have had the prophet Isaiah sawn in half, which was referenced in Hebrews 11:37. [This passage in Hebrews refers to a prophet sawn in half, but does not name the perpetrator or victim, so it's not for certain that Isaiah is the one mentioned there.
http://www.visi.com/~nathan/xtian/dontshoot.html

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Romans 6:4
4 Therefore we were buried with Him through baptism into death, that just as Christ was raised from the dead by the glory of the Father, even so we also should walk in newness of life.