It apparently is a marriage certificate ("Trauschein") between Wilhelm August Krahmer and Marie Christiane Wilhelmine Cramer, married 8. Jun 1841 in Moscow.
The document is an excerpt from the marriage register of the evangelic-lutheric church St Michaelis in Moscow ("Moskwa") which was created 9 years later.
It goes on to mention that Wilhelm was a Doctor of Philosophy and "licensed theologist" (whatever that was) and the son of an estate farm owner Christian Friedrich Krahmer in Nordhausen.
Marie's Father Georg was a teacher from Göttingen.