Sunan Ibn Majah
224
Very Daif+3

It was narrated from Anas bin Malik that the Messenger of Allah (ﷺ) said:"Seeking knowledge is a duty upon every Muslim, and he who imparts knowledge to those who do not deserve it, is like one who puts a necklace of jewels, pearls and gold around the neck of swines

Very DaifAl-Albani
Very DaifMuhammad Fouad Abd al-Baqi