פירוש על ברכות 110:16

M.: R. Bizta stated that R. Zera said in the name of R. 'Ukba...R. Pabna...R. Tanhum...R. Parna...who is he? R. Nehorai.

Bacher considers הפה "the mouth" to have been originally 'הפ, abbreviation for הפתרונות "the interpretations." See R. E. J. xxvii. pp. 141 ff.