Bahira/Saiba/Wasila/Ham:-
Al-Bahira was an animal whose milk was spared for the idols and other dieties, and so nobody was allowed to milk it.
As-Saiba was an animal which they (i.e infidels) used to set free in the names of their gods so that it would not be used for carrying anything.
Wasila is the she-camel which gives birth to a she-camel as its first delivery, and then gives birth to another she-camel as its second delivery. People (in the Pre-Islamic periods of ignorance) used to let that she-camel loose for their idols if it gave birth to two she-camels successively without giving birth to a male camel in between.
Ham/Hami was the male camel which was used for copulation. When it had finished the number of copulations assigned for it, they would let it loose for their idols and excuse it from burdens so that nothing would be carried on it
5: 103 Allah hath not appointed anything in the nature of a Bahirah or a Saibah or a Wasilah or a Hami, but those who disbelieve invent a lie against Allah. Most of them have no sense.
Sahih Al-Bukhari HadithHadith 4.723 6.147 Narrated bySaid bin Al Musaiyab
Bahira is a she-camel whose milk is kept for the idols and nobody is allowed to milk it; Sa'iba was the she-camel which they used to set free for their gods and nothing was allowed to be carried on it. Abu Huraira said: Allah's Apostle said, "I saw 'Amr bin 'Amir Al-Khuzai (in a dream) dragging his intestines in the Fire, and he was the first person to establish the tradition of setting free the animals (for the sake of their deities)." Wasila is the she-camel which gives birth to a she-camel as its first delivery, and then gives birth to another she-camel as its second delivery. People (in the Pre-Islamic periods of ignorance) used to let that she-camel loose for their idols if it gave birth to two she-camels successively without giving birth to a male camel in between. 'Ham' was the male camel which was used for copulation. When it had finished the number of copulations assigned for it, they would let it loose for their idols and excuse it from burdens so that nothing would be carried on it, and they called it the 'Hami.' Abu Huraira said, "I heard the Prophet saying so."
Sahih Al-Bukhari HadithHadith 6.243 Narrated byJabir bin Abdullah
Allah's Apostle said, "Whoever, after listening to the Adhan (for the prayer) says, 'O Allah, the Lord of this complete call and of this prayer, which is going to be established! Give Muhammad Al-Wasila and Al-Fadila and raise him to Al-Maqam-al-Mahmud which You have promised him,' will be granted my intercession for him on the Day of Resurrection."
*** Muhammad aws always very liberal with his PROMISES to his gullible, ignorant and superstitious followers, especially since he knew very well, that none of them would ever question his VERACITY***
Sahih Al-Bukhari HadithHadith 8.745 Narrated byAbdullah
The Muslims did not free slaves as Sa'iba, but the People of the Pre-Islamic Period of Ignorance used to do so.