דניאל י:ז פירוש: רש״י

but the men who were with me Our Sages of blessed memory said that they were Haggai, Zechariah, and Malachi.

but a great quaking fell upon them Our Sages of blessed memory said that although a person does not see something of which he is terrified, his guardian angel, who is in heaven, does see it; therefore, he becomes terrified.