Angel Gabriel appears to someone… Zacharias, Daniel, Mary and Joseph.
Hi
So you believe that Gabriel appeared to ProphetsMessengers of GodAllahYHWH and other saintly persons, likewise he appeared and conveyed the message to Muhammad, so it is not a strange thing to happen.
Quran
[2:94] And remember the time when We took a covenant from you and raised high above you the Mount, saying, ‘Hold firmly to what We have given you and hearken;’ They said, ‘We hear and we disobey;’ and their hearts were saturated with the love of the calf because of their disbelief. Say ‘Evil is that which your faith enjoins on you, if you are believers,’
[2:95] Say, ‘If the abode of the Hereafter with Allah is solely for you to the exclusion of all other people, then wish for death, if you are truthful.’
[2:96] But never shall they wish for it, because of what their own hands have sent on before them; and Allah knows the wrongdoers well.
[2:97] And thou shalt surely find them, of all people, the most covetous of life, even more than those who set up equals with God. Every one of them wishes that he may be granted a life of a thousand years, but his being granted such a life shall not remove him further away from the punishment; and Allah sees all they do.
[2:98] **Say, ‘Whoever is an enemy to Gabriel’ - for he it is who has caused it to descend on thy heart by the command of Allah, fulfilling that revelation which precedes it, and is a guidance and glad tidings to the believers. **
[2:99] ‘Whoever is an enemy to Allah, and His angels, and His Messengers, and Gabriel, and Michael, then surely, Allah is an enemy to such disbelievers.’
[2:100] And surely We have sent down to thee manifest Signs, and none disbelieves in them but the disobedient.
Unquote
GodAllahYHWH Himself is a witness that he sent down Gabriel on the heart of Muhammad.
I think witnessing of GodAllahYHWH is sufficient for a truthful person, one should agree.
No compulsion
Thanks