Will everyone greeted by the Messenger of Allah, may Allah's prayers and peace be upon him, not be touched by the Fire, and what is the treasure that the Messenger of Allah, may Allah's prayers and peace be upon him, told my brother about?

If a Muslim sees the Prophet, peace and blessings be upon him, in a dream in his true form, and the vision is a harbinger of good or contains good tidings, then it is a good omen for the one who sees it. However, if he sees him angry or disapproving, or if the dream interpreter indicates evil in it, then he should take heed and rectify his shortcomings.

There is no validity to the claim that whoever sees the Prophet, peace and blessings be upon him, in a dream, in any state, has been forbidden from the Fire and given glad tidings of Paradise, as there is no sound evidence to support this statement. The hadith: "The Fire shall not touch a Muslim who saw me or saw one who saw me" has been deemed weak.

As for the hadith: "Whoever sees me in a dream will see me in a waking state," it has several interpretations, including that it refers to seeing him in the Hereafter, or attaining his intercession and closeness to him on the Day of Resurrection, or that whoever sees him in a dream in his true form is assured of the truthfulness of his vision as if he saw him in a waking state.

Conclusion: Seeing the Prophet, peace and blessings be upon him, in a dream is among the good tidings, but it does not mean certainty of entering Paradise or salvation from the Fire.