[3940] He made the piled-up iron bars as high as the two mountain tops so that they rested at the same level as each other (cf. al-Ṭabarī, al-Qurṭubī, Ibn Kathīr).
[3941] Molten copper (qiṭr) when poured on an uneven pile of fire-hot iron bars would make the bars stick together, fill up the cracks and smooth out the surface (cf. al-Eījī, al-Thaʿālibī, al-Shaʿrāwī).