The magic-angle spinning 31P NMR spectrum of Cd3P2 is reported. Three lines with intensities nearly 1:1:2 are observed, as expected from the X-ray determined crystal structure. In light of this agreement and the reported identical crystal structures, the 31P NMR of Zn3P2 is re-examined. At room temperature, a doublet of equal intensities is observed and has been explained previously as an accidental overlap. This interpretation is confirmed by the observation that the overlap is removed at low temperatures. In addition, an unexpected overall frequency shift with temperature is observed and attributed to a Knight-shift-type mechanism.