And when he mentioned their denial, he indicated [it] by his saying: "When". This means that their denial or their tyranny was realized by action when "the most wretched of them arose". This refers to the one who was the most wretched of Thamud, which is the one who slaughtered the she-camel due to participating in disbelief and increasing it by directly causing the slaughter. He is Qidar ibn Salif, or he is [and] whoever assisted him in the slaughtering of it. For indeed, the superlative form, when it is added, is suitable for both singular and plural.