Is it permissible for the Imam of the mosque or for the worshippers to prevent beggars who disturb worshippers after the prayer, and what is the interpretation of the verse, "And as for the orphan, do not oppress [him]," in this context?

Begging is forbidden except out of dire necessity. If beggars ask for money in the mosque without need, or if they are able to earn a living, or if they cause disturbance to the worshippers, then it is permissible to prevent them. The act of begging, whether inside or outside the mosque, is originally forbidden except out of necessity. If there is a necessity, and the beggar does not harm anyone, does not lie, and does not raise his voice in a way that harms people, then his asking is permissible. As for the needy beggar, he should not be rebuked; rather, he should be given something or politely turned away. Preventing them from the mosque should be done gently. If the beggars in the mosque are free from the aforementioned prohibitions, then scholars have stipulated that it is disliked, and giving to them is an act of closeness to Allah for which one is rewarded. The dislike stems from the saying of the Prophet, peace and blessings be upon him: "Indeed, mosques were not built for this."