"Whoever obeys me, indeed s/he obeys Allah (SWT)." (Bukhari, Muslim)
"Whoever revives my Sunnah, that means s/he loves me, and whoever loves me, s/he is together with me in the heaven." (Tirmidhi)
Since the prophets are sacred, why weren't they sent from amongst the angels, but were sent from amongst the impotent human beings? And also if they were sent from amongst the angels, would not much more people be eager to believe them?