Sahih Bukhari Volume 003, Book 027, Hadith Number 019.
Narated By Isma'il : Abdullah bin Abu Aufa said: "Allah's Apostle performed 'Umra and we too performed 'Umra along with him. When he entered Mecca he performed the Tawaf (of Ka'ba) and we too performed it along with him, and then he came to the As-Safa and Al-Marwa (i.e. performed the Sai) and we also came to them along with him. We were shielding him from the people of Mecca lest they may hit him with an arrow." A friend of his asked him (i.e. 'Abdullah bin Aufa), "Did the Prophet enter the Ka'ba (during that 'Umra)?" He replied in the negative. Then he said, "What did he (the Prophet) say about Khadija?" He (Abdullah bin Aufa) said, "(He said) 'Give Khadija the good tidings that she will have a palace made of Qasab in Paradise and there will be neither noise nor any trouble in it."