Muslim

Hadith Commentary:
So it will be the Messenger of Allah (sallallahu alayhi wa sallam) himself.

Hadith Commentary: Benefits and Issues: "Whoever sees me in a dream":

There are two viewpoints regarding the vision (seeing) of the Prophet sallallahu alayhi wa sallam:

(1)
The view of Imam Muhammad ibn Sirin, Imam Bukhari, Qadi Iyad, and a group of scholars is that this hadith pertains to that vision in which the dreamer sees the Prophet sallallahu alayhi wa sallam in his well-known and famous form and appearance.

(2)
Another group holds the view that it is not a condition for seeing the Prophet sallallahu alayhi wa sallam that the dreamer sees him in his original, well-known, and famous form and appearance. If the dreamer is certain that it is the Prophet sallallahu alayhi wa sallam, then regardless of the form or appearance in which he is seen, it is indeed him.

"Faqad ra’ani" (then he has seen me):

According to some scholars, the dreamer has seen the very noble person of the Prophet sallallahu alayhi wa sallam, while according to others, he has seen his likeness and form. Qadi Ibn al-Arabi al-Maliki holds that whoever sees the Prophet sallallahu alayhi wa sallam in his well-known attributes has seen his person, and whoever sees him in another attribute has seen his likeness and reflection. According to Imam Ghazali, the dreamer, in every form and every state, sees only the reflection of the Prophet sallallahu alayhi wa sallam; he does not see his soul or personality.
(: ‘Umdat al-Qari, vol. 2, p. 155)

However, if in a dream the Prophet sallallahu alayhi wa sallam gives information about something or commands or forbids something, since in this there is an effect of the dreamer’s understanding, perception, and imagination, it will be actionable only if it is in accordance with the Qur’an and Sunnah. If it is contrary, then it is the dreamer’s own imagination and conception. For example, a man said that the Messenger of Allah sallallahu alayhi wa sallam told him in a dream, “Drink wine.” Imam Ali al-Muttaqi, the author of Kanz al-‘Ummal, said: The Messenger of Allah sallallahu alayhi wa sallam actually said, “Do not drink wine,” but Satan put into your imagination, “Drink wine,” because you drink wine.
(: Faydh al-Bari, vol. 1, p. 203)

And seeing the Prophet sallallahu alayhi wa sallam in a dream does not make anyone a Companion (Sahabi), because a Sahabi is one who saw the Prophet sallallahu alayhi wa sallam in his lifetime as a Muslim in the usual manner. However, if someone saw the Prophet sallallahu alayhi wa sallam in a dream during his lifetime and then had the opportunity to see him while awake, he would become a Sahabi. This is the meaning of "seerani fi al-yaqazah" (he will see me while awake).

But if someone saw him in a dream after his (the Prophet’s) life, and then also saw him while awake—as claimed by Allamah Alusi, that those who visit the Prophet sallallahu alayhi wa sallam in a dream also visit him while awake
(: Ruh al-Ma‘ani, vol. 22, 4th edition, p. 36)
—then such a person will not be a Sahabi.

Imam Sha‘rani has written: I read Sahih Bukhari in a waking state with the Prophet sallallahu alayhi wa sallam along with eight companions.
(: Faydh al-Bari, vol. 1, p. 214)

But it is strange that many people claim that they saw the Prophet sallallahu alayhi wa sallam in a dream and later saw him while awake, and that in matters in which they were troubled, they asked the Prophet sallallahu alayhi wa sallam about those matters and he removed their worries and explained those matters well. Whereas the reality is that the Rightly Guided Caliphs, the Ahl al-Bayt, the Companions, the jurists and the Tabi‘in, and the four Imams differed among themselves in many matters, and in some cases the matter became prolonged, but the Prophet sallallahu alayhi wa sallam did not meet anyone while awake, nor did he resolve their differences or guide them. At the very least, he would have resolved the dispute between Fatimah and Abu Bakr regarding inheritance, guided the Muslims during the Battle of Jamal and the Battle of Siffin, shown Aisha radi Allahu anha, Ali, and Mu‘awiyah a way out of their difficulties, resolved the case of the killers of Uthman, and warned Husayn radi Allahu anhu about the treachery of the Kufans. He did not meet these dear relatives and companions, but according to these claimants, he conversed with later people and removed their worries.

Benefits and Issues:
This is a unique characteristic of the Prophet (sallallahu alayhi wa sallam):
That Satan cannot assume your form.
However, it is possible that he may appear in another form and create the illusion that this is the Messenger of Allah (sallallahu alayhi wa sallam).
Therefore, it is necessary that a person compares the form he saw with those characteristics
which are mentioned in the books of hadith.
Or he should seek confirmation from a person of knowledge.
The late father, Sheikh Abdul Aziz Saeedi rahimahullah, was once told by an innovator, with great enthusiasm and passion, that he had seen the Noble Prophet (sallallahu alayhi wa sallam) in a dream.
When my father asked for details, he replied that he had seen a luminous personality with a white, radiant beard.
My father immediately
recited "La hawla wa la quwwata illa billah" and clarified that you have seen a devil.
In short, the one who sees the Noble Prophet (sallallahu alayhi wa sallam) in a dream will see him while awake on the Day of Resurrection and will attain a special closeness.
Otherwise, other believers will also see you (sallallahu alayhi wa sallam).