The bahirah was a she-camel whose milk was withheld for the idols, so no one among the people would milk her. As for the saaibah, they would set her loose for their gods, so nothing would be loaded upon her.Abu Hurairah said, the Messenger of Allah ﷺ said, "I saw Amr bin Amir al-Khuzai dragging his intestines in the Fire. He was the first to set free the saaibahs."The wasilah was a virgin she-camel that came as the first offspring among the camels, then was followed by another female, with no male between them. They would set them loose for their idols when one was joined to the other without a male in between.The hami was the stud camel that completed a set number of matings. Once he had fulfilled his matings, they would dedicate him to the idols and exempt him from carrying loads, so nothing would be placed on him, and they called him the hami.
البحيرة التي يمنع درها للطواغيت فلا يحلبها أحد من الناس والسائبة: كانوا يسيبونها لآلهتهم فلا يحمل عليها شيء. قال: وقال أبو هريرة: قال رسول الله ﷺ: رأيت عمرو بن عامر الخزاعي يجر قصبه في النار، كان أول من سيب السوائب. والوصيلة الناقة البكر، تبكر في أول نتاج الإبل، ثم تثني بعد بأنثى، وكانوا يسيبونها لطواغيتهم، إن وصلت إحداهما بالأخرى ليس بينهما ذكر. والحام: فحل الإبل يضرب الضراب المعدود، فإذا قضى ضرابه ودعوه للطواغيت وأعفوه من الحمل، فلم يحمل عليه شيء وسموه الحامي.
Bukhari narrated it in the tafsir (4623), and Muslim narrated it in the Paradise chapter (51:2856), both through the route of Ibrahim bin Saad, from Salih bin Kaysan, from Ibn Shihab, who said, "I heard Saeed bin Musayab say," and he mentioned it. The wording given here is Bukhari's, while Muslim's wording is shorter.