It is mentioned in the tradition of Imam Jawad (a.s.) that Imam
Ali Reza (a.s.) went to visit a seriously ailing man in the throes of
death.
After some conversation that patient said: “All these angels
are standing before you; allow them to sit.” The angels sat down by
the order of the Imam.
After that His Eminence said to the patient: “Ask them whether
they were ordered to stand in my presence.”
The patient said: “I asked them and they said that even if all the angels were present here, they would have to stand up for you and they cannot sit till you don’t permit them as they are ordered this by Almighty Allah.”
Behaarul Anwaar, vol. 6, p. 195
Isbaatul Wilayah (Part One) – Ayatullah AliNamazi Shahroodi (r.a.)