Oneness, Uniqueness of Allah (Tawheed)

Bukhari :: Book 9 :: Volume 93 :: Hadith 588

Narrated Abu Huraira:

The Prophet said that Gabriel said, "Here is Khadija coming to you with a dish of food or a tumbler containing something to drink. Convey to her a greeting from her Lord (Allah) and give her the glad tidings that she will have a palace in Paradise built of Qasab wherein there will be neither any noise nor any fatigue (trouble)." (See Hadith No. 168, Vol. 5)