Although Lady Khadijah (SA), Ummul Momeneen, has not been mentioned clearly in the Quran but in Ayah 8 of Surah Dhuha she has been mentioned indirectly, as it is mentioned in Ayah:

Did God not find you in need and make you self-sufficient? Although this wealth has been granted to the Prophet of Islam (PBUH) in different ways, but as Allamah Majlisi (RA) narrated: Allah (SWT) has made the Prophet (PBUH) self-sufficient with Lady Khadijah’s (SA) wealth, because this Ayah is referring to Lady Khadijah (SA) [1]. In another commentary of this Ayah, Ibn Abbas said: Allah (SWT) found the Prophet (PBUH) poor and people used to say the Prophet (PBUH) has no wealth; but with Lady Khadijah’s (SA) wealth, God made him self-sufficient [2].

[1] Beharul Anwaar, Vol. 43, Page 49.

[2] Al-Borhan fi Tafseerul Quran, Vol. 4, Page 473.

Source: en.shafaqna.com