أنّ الله عزّ وجلّ خصّ آل محمّد عليهم السلام بالامامة دون غيرهم

[1] The Qurʾān.

[2] An idiomatic expression found even in Sunni traditions, used by the Apostle of Allāh صلى الله عليه وعلى آله to convey the fathomless immensity of the Sanctified Basin by comparing it to the distance between Sanaa, the capital of modern Yemen, and Aqaba, modern Jordan's only port on the Red Sea, which was until the late Middle Ages known as “Ayla.” The straight-line distance between Sanaa and Aqaba is 1,831 kilometres.