Color of Prophet Muhammad and the Arabs at the emergence of Islam
Some people claim that Prophet Muhammad was black, but it's contrary to the following writings:

Muhammad described as a white man (Sahih Bukhari)
Muhammad described as white (Sahih Bukhari)
Muhammad described as white (Sahih Muslim)
White cheek of Prophet Muhammad (Sahih Muslim)
White complexion of Muhammad (Sahih Muslim)
Muhammad was not brown (Sahih Muslim)
White thigh of Prophet Muhammad (Sahih Bukhari)
White abdomen of Prophet Muhammad (Sahih Bukhari)
(Extra) Muhammad sold 2 black slaves for 1 slave (Sahih Muslim)

Muhammad described as a "white man" (Sahih Bukhari : hadith 63)
Anas bin Malik (RA) reported that when a person inquired the companions about the Holy Prophet –peace and blessings of Allah be upon him- they pointed towards him saying;

"This white man (rajul al-abyad) reclining on his arm."

Muhammad described as "white" (Sahih Bukhari : hadith 3544)
Narrated Isma`il bin Abi Khalid:
I heard Abii Juhaifa saying, "I saw the Prophet, and Al-Hasan bin `Ali resembled him." I said to Abu- Juhaifa, "Describe him for me." He said, "He was white and his beard was black with some white hair. He promised to give us 13 young she-camels, but he expired before we could get them."

Muhammad described as "white" (Sahih Muslim : hadith 2340 [6072])
Abû At-Tufail reported:
"I saw the Messenger of Allah and there is no one else (left) on the face of the earth who saw him apart from me." He (the narrator) said to him: 'How did you see him?' He said: 'He was white and elegant, of average height and build.'"

White cheek of Prophet Muhammad (Sahih Muslim : hadith [1315] 119 - 582)
It was narrated from 'Amir bin Sa'd that his father said: "I used to see the Messenger of Allah saying the Salâm to his right and his left, until I could see the whiteness of his cheek."

White complexion of Muhammad (Sahih Muslim : hadith 2343 [6081/107])
It was narrated that Abü Juhaifah said: "I saw the Messenger of Allah with a white complexion and
some white hairs. Al-Hasan bin 'Ali resembled him."

Muhammad was not brown (Sahih Muslim : hadith 2347)
It was narrated that Anas bin Mâlik said:
"The Messenger of Allah was neither very tall nor short, and he was neither glaringly white nor brown, and his hair was neither very curly nor straight. Allah appointed him (as His Messenger) when he reached the age of forty, and he stayed in Makkah for ten years, and in Al-Madinah for ten years. Allah caused him to die when he was sixty years old, and there were no more than twenty white hairs in his hair and beard."

White thigh of Prophet Muhammad (Sahih Bukhari : 371)
Narrated 'Abdul 'Aziz: Anas said, "When Allah's Messenger invaded Khaibar, we offered the Fajr prayer
there (early in the morning) when it was still dark. Allah's Prophet rode and Abu Talha rode, too, and I was riding behind Abu Talha. AlIah's Prophet passed through the lane of Khaibar quickly and my knee was touching the thigh of Allah's Prophet. Then his thigh was uncovered by the shift of his Izar (waist-sheet), and I saw the whiteness of the thigh of Allah's Prophet.

White abdomen of Prophet Muhammad (Sahih Bukhari : hadith 7236)
Narrated Al-Bara' bin 'Azib: The Prophet was carrying earth with us on the Day (of the battle)
of Al-Ahzab (the Confederates) and I saw that the dust was covering the whiteness of his abdomen,

Muhammad sold 2 black slaves for 1 slave (Sahih Muslim : hadith 1602)
It was narrated that Jâbir said: "A slave came and swore allegiance to the Prophet, pledging to emigrate,
and he did not realize that he was a slave. Then his master came looking for him.
The Prophet said: 'Sell him to me,' and he bought him for two black slaves.
Then after that he did not accept the oath of allegiance of anyone until he had asked: 'Is he a slave?"