ما صحة الحديث الذي يذكر أن في النار واديًا يسمى وادي الملحم، تعيش فيه حيات وعقارب تصف تارك الصلاة؟

This hadith is not mentioned in the accredited books of the scholars. It appeared in some editions of Al-Dhahabi's Kitab Al-Kaba'ir (Book of Major Sins) which some researchers have questioned. Some people circulate it on the internet without a chain of narration (sanad), and it is not permissible to attribute it to the Prophet, peace be upon him, until its authenticity is ascertained.