The net ionic equation for the precipitation of calcium sulfide in solution is; Ca^2+(aq) + S^2-(aq) -------> CaS(s)
Let me give a typical instance since your question is incomplete. Imagine an aqueous solution of H2S and CaCl2 from which calcium sulfide does precipitate.
The molecular reaction equation is;
H2S(aq) + CaCl2(aq) -------> CaS(s) + 2HCl(aq)
The complete ionic equation is;
2H^+(aq) + S^2-(aq) + Ca^2+(aq) + 2Cl^-(aq) -------> CaS(s) + 2H^+(aq) + 2Cl^-(aq)
The net ionic equation is;
Ca^2+(aq) + S^2-(aq) -------> CaS(s)
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