Mas‘ūdī, another scholar of Ahl al-Sunnah, writes about the birth of Imam Ali (peace be upon him) in Ithbāt al-Wasiyah, Page 142 in the following way:
"It is narrated that when Fāṭimah bint Asad was pregnant with Amīr al-Mu’minīn (Ali, peace be upon him), she was performing the ṭawāf (circumambulation) around the Ka‘bah. When labor pains began to strike, she entered the Ka‘bah and gave birth to him inside the sacred house."
Reference: This narration confirms that Mas‘ūdī also mentions that Fāṭimah bint Asad (may Allah be pleased with her) gave birth to Imam Ali (peace be upon him) inside the Ka‘bah while performing the ṭawāf.
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