Canon 1086. §1 A marriage between two persons, one of whom was baptized in the
Catholic Church or received into it, and the other of whom is not baptized, is invalid.
[revised wording according to m.p. Omnium in mentem, 26.X.2009]

§2 This impediment is not to be dispensed unless the conditions mentioned in cann.
1125 and 1126 have been fulfilled.

§3 If at the time the marriage was contracted one party was commonly understood to be baptised, or if his or her baptism was doubtful, the validity of the marriage is to be presumed in accordance with can. 1060, until it is established with certainty that one party was baptised and the other was not.

§1. Matrimonium inter duas personas, quarum altera sit baptizata in Ecclesia catholica vel in eandem recepta {nec actu formali ab ea defecerit}, et altera non baptizata, invalidum est. {Textus inter notas abrogatus est per littera apostolica motu proprio Omnium in Mentem die XXVI mensis Octobris anno MMIX.}

§2. Ab hoc impedimento ne dispensetur, nisi impletis condicionibus de quibus in can. 1125 et 1126.

§3. Si pars tempore contracti matrimonii tamquam baptizata communiter habebatur aut eius baptismus erat dubius, praesumenda est, ad normam can. 1060, validitas matrimonii, donec certo probetur alteram partem baptizatam esse, alteram vero non baptizatam.