Is it permissible to boast about knowledge to people, and did this occur from the Prophets, Messengers, and Saints?

The believer must purify their heart from self-admiration (Ujb) concerning knowledge or anything else, and acknowledge Allah's favor upon them for what He has bestowed. Prophets and Messengers, and those who followed them, are free from self-admiration, and they are the most sincere people towards Allah.

A Muslim, especially a student of knowledge, must follow them, ensuring that their intention in seeking knowledge is for the sake of Allah Almighty, and not to boast to people, because "actions are but by intentions."

The Prophet (peace be upon him) said: "Do not learn knowledge to boast thereby to the scholars, or to argue thereby with the foolish, or to turn the faces of people towards you thereby. Whoever does that, then he is in the Fire."

The true scholar does not admire themselves; for the more they increase in knowledge, the more they increase in awareness of their ignorance and poverty before Allah, and in humility and submission. Whoever admires their knowledge has gone against the essence of knowledge and the guidance of the Prophets and scholars, and has exposed themselves to the warning.