Did the Prophet (peace and blessings of Allaah be upon him) have nine wives or eleven?

The scholars differ concerning the number of wives that the
Prophet (peace and blessings of Allaah be upon him) had. The majority
are of the view – which is correct – that he had eleven wives with whom he
(peace and blessings of Allaah be upon him) consummated marriage, and
he left nine of them behind when he died. Khadeejah bint Khuwaylid and
Zaynab bint Khuzaymah – may Allaah be pleased with them both – died before
him (peace and blessings of Allaah be upon him). 

This is the view of his companions, as the imams narrated
from them in their saheeh books. 

It was narrated from Anas (may Allaah be pleased with him)
that the Prophet (peace and blessings of Allaah be upon him) used to go
around his wives in a single night, and he had nine wives. Narrated by
al-Bukhaari, 280. 

Mu’aadh ibn Hishaam narrated from his father, according to a
report narrated by al-Bukhaari (265) from him alone, that there were eleven
wives, but he was mistaken; the correct view is that he went around to nine
wives. 

Ibn Hajar said: 

Ibn Khuzaymah said: Mu’aadh ibn Hishaam was the only one who
narrated that from his father, and it was narrated by Sa’eed ibn ‘Uroobah
and others from Qataadah but they said “nine wives.” Al-Bukhaari referred to
the report of Sa’eed ibn Abi ‘Uroobah in a mu’allaq report here, but twenty
chapters later he narrated it in a mawsool report when he said: “He used to
go around his wives in one night, and at that time he had nine wives.” 

Fath al-Baari, 1/377. 

It was
narrated that ‘Ata’ said: We, along with Ibn ‘Abbaas, attended the funeral
of Maymoonah in Sarif. Ibn ‘Abbaas said: This is the wife of the Prophet
(peace and blessings of Allaah be upon him). When you lift up her bier,
do not shake it or rock it; be gentle, for the Prophet (peace and
blessings of Allaah be upon him) had nine wives and he used to give a
portion of his time to eight and not to one.

Narrated by al-Bukhaari, 4780; Muslim, 1465. 

The one to whom he did not give a portion of his time was
Sawdah bint Zam’ah, when she gave up her night to ‘Aa’ishah (may Allaah be
pleased with her). 

Ibn al-Qayyim said: 

There is no scholarly dispute concerning the fact that he
left nine behind when he died and that he used to give a portion of his time
to eight of them. Those nine were: ‘Aa’ishah, Hafsah, Zaynab bint Jahsh, Umm
Salamah, Safiyyah, Umm Habeebah, Maymoonah, Sawdah and Juwayriyyah. The
first of his wives to follow him after he died was Zaynab bint Jahsh in 20
AH and the last of them to die was Umm Salamah in 62 AH during the caliphate
of Yazeed. 

Zaad al-Ma’aad, 1/114 

With regard to his female slaves, he
(peace and blessings of Allaah be upon him) had four female slaves.

Ibn al-Qayyim said: 

Abu ‘Ubaydah said: He had four: Maariyah who was the mother
of his son Ibraaheem; Rayhaanah; another beautiful slave women who he got
among some of the prisoners of war; and a slave woman who was given to him
by Zaynab bint Jahsh. 

Zaad al-Ma’aad, 1/114.