Is it permissible to use public funds, not a large amount, for da'wah purposes and non-private matters?

Public funds are protected by Islamic law, and their sanctity may be even greater than that of private funds due to the multiplicity of owners. The Prophet, peace be upon him, warned against embezzlement (ghulul) and emphasized its gravity, mentioning that embezzlement will be a source of shame, fire, and disgrace for its perpetrators on the Day of Judgment. Public funds belong to all Muslims and are designated for their religious and worldly interests, among the most important of which is establishing good and forbidding evil, and teaching people the affairs of their religion.

Therefore, those in charge of the Muslim treasury (Bayt al-Mal) must allocate a substantial portion to calling people to Allah and teaching them what is good. If this allocation is withheld, and there is no other means for the callers (du'at) to finance their projects, and they are able to acquire public funds through legitimate means (such as a job title or an acceptable position with the authority managing public funds), then there is no harm in that. However, taking it through illegitimate means may lead to corruption for the call (da'wah) and the callers.