sermonize

verb4

1. •
   To speak in the manner of a sermon; to preach; to propagate one's morality or opinions with speech.

   • And doe not our Prelates thus, when […] they disgrace and traduce Preaching, calling it in scorne, Sermonizing? — 1636
2. •
   To preach a sermon to (somebody); to give (somebody) instruction or admonishment on the basis of one's morality or opinions.

   • He wishes, I suppose, to sermonize me: but I shall not give him an opportunity— — 1798
3. •
   To say in the manner of a sermon or lecture.

   • “Children, children! Woe, how you do sin!” Mrs. Kavarsky sermonized. “Come now, obey an older person […]” — 1896
4. •
   To inculcate rigid rules.