cast pearls before swine

From the Bible "Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you." – KJV, Matthew 7:6

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cast pearls before swine (third-person singular simple present casts pearls before swine, present participle casting pearls before swine, simple past and past participle cast pearls before swine)

1. (idiomatic) To give things of value to those who will not understand or appreciate them.

• preach to deaf ears

• caviar to the general
• talk over somebody's head