Western civilization being the one of the first civilization to outlaw slave ownership, that civilization?
Well they may have been one of the first in that in 1347 Poland was the first western nation to abolish slavery in all its forms. Earlier bans in other western countries were usually of the form that Christians could not be held as slaves, but members of other religions could.
However, in at least one western nation slavery is acceptable under certain conditions and is written into their constitution:
Passed by Congress on January 31, 1865, and ratified on December 6, 1865, the 13th amendment abolished slavery in the United States and provides that "Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.".