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HI!!

I have a doubt about the MO diagram of NH3

Here  a picture with the MOs:
https://en.m.wikibooks.org/wiki/Advanced_Inorganic_Chemistry/NH3_Molecular_Orbitals

Now why  I mix the s  pz px and py of N with a combination of 3H (salc) and  I'm not using instead the hybrid orbital sp3??

Why when we make a MO diagram we use the ""standard"" s,px,pz  and py orbital of N  and NOT the four sp₃ orbitals of N?

Thanks!