What worldly matters has the Sharia forbidden discussing in the mosque, if the matters mentioned in question number (4448) are true?

Mosques are places of worship, and Allah has commanded their glorification and prescribed special rulings for them. Among the prohibitions in the mosque are the following:

1. Announcing Lost Items: This refers to raising one's voice to inquire about something lost. However, asking in a low voice is permissible. Similarly, it is prohibited to raise one's voice to announce a lost and found item (luqata), which should be announced at the mosque's entrance. 2. Buying and Selling: Both are forbidden in the mosque. 3. Reciting Poetry Aloud: Vocal recitation of poetry is prohibited, especially if it turns the mosque into a literary gathering or contains blameworthy meanings. However, reciting permissible poetry, such such as that which defends Islam or contains wisdom, is allowed. 4. Engaging in Worldly Talk: This is disliked if it is predominant, disruptive, accompanied by clamor and raised voices. However, permissible worldly talk, free from disruption and raised voices, is acceptable. 5. Raising One's Voice Generally: It is disliked to raise one's voice in the mosque, even when reciting the Quran or engaging in dhikr, if it disturbs others, except for what the Sharia has permitted, such as the adhan, audible prayers, and the khutbah.

As for the Abyssinians' playing with spears in front of the Prophet, peace and blessings be upon him, it was not acrobatic games but rather combat training.