Bukhari

Hadith Commentary:
1.
In one narration, when the Messenger of Allah (sallallahu alayhi wa sallam) conveyed the greeting of peace from the Lord to Khadijah (radi Allahu anha), she replied:
Allah, Exalted is He, is the very essence of peace, so peace be upon Jibril (alayhis salam), and O Messenger of Allah (sallallahu alayhi wa sallam), peace be upon you as well, and the mercy and blessings of Allah.
(Al-Sunan al-Kubra by al-Nasa’i: 5/94)
In another narration:
Peace is upon whoever hears this, except the accursed Shaytan.
(‘Amal al-Yawm wa’l-Laylah by Ibn al-Sunni, no. 239)
Allah, Exalted is He, granted Khadijah (radi Allahu anha) understanding and insight.
She did not reply to the greeting from Allah with “alayhis salam” because He Himself is Peace, but rather, the greeting of peace is replied to when it comes from the creation.
Then, she made an exception for the accursed Shaytan, because he is not deserving of peace or supplication.

2.
Jibril (alayhis salam) conveyed the greeting of Allah, Exalted is He, to the Messenger of Allah (sallallahu alayhi wa sallam) through his mediation; he did not greet him directly, because this was required out of respect for the Messenger of Allah (sallallahu alayhi wa sallam). However, Jibril (alayhis salam) greeted Maryam (alayhas salam) directly, addressing her personally, because she had no mahram through whom the greeting would be conveyed.
(Fath al-Bari: 7/174)

Hadith Commentary: Benefits and Issues: The Prophet sallallahu alayhi wa sallam would take into consideration the temperament and nature of his companions, showing them kindness and consideration so that their feelings would not be hurt without reason. Since Mukharramah radi Allahu anhu had a somewhat hot and intense temperament, the Prophet sallallahu alayhi wa sallam, understanding the purpose of his arrival, did not give him the opportunity to speak and instead immediately gifted him a cloak.