Re: First Wife’s Permission
I’m dead sure there’s a hadith on it.
Found’em:
Source: Sahih Bukhari
Volume 5, Book 58, Number 164:
Narrated
'Aisha: I did not feel jealous of any of the wives of the Prophet as much as I did of Khadija (although) she died before he married me, for I often heard him mentioning her, and Allah had told him to give her the good tidings that she would have a palace of Qasab (i.e. pipes of precious stones and pearls in Paradise), and whenever he slaughtered a sheep, he would send her women-friends a good share of it.
Volume 5, Book 58, Number 165:
Narrated 'Aisha:
I did not feel jealous of any woman as much as I did of Khadija because Allah’s Apostle used to mention her very often. He married me after three years of her death, and his Lord (or Gabriel) ordered him to give her the good news of having a palace of Qasab in Paradise.
Volume 5, Book 58, Number 166:
Narrated 'Aisha:
I did not feel jealous of any of the wives of the Prophet as much as I did of Khadija though I did not see her, but the Prophet used to mention her very often, and when ever he slaughtered a sheep, he would cut its parts and send them to the women friends of Khadija. When I sometimes said to him, “(You treat Khadija in such a way) as if there is no woman on earth except Khadija,” he would say, “Khadija was such-and-such, and from her I had children.”
Volume 7, Book 62, Number 156:
Narrated 'Aisha:
I never felt so jealous of any wife of Allah’s Apostle as I did of Khadija because Allah’s Apostle used to remember and praise her too often and because it was revealed to Allah’s Apostle that he should give her (Khadija) the glad tidings of her having a palace of Qasab in Paradise .
And there are plenty more on it.