It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "If a stone equal in size to seven pregnant she-camels, together with their fat and the young in their wombs (extremely heavy and massive), were thrown into Hell, it would keep falling in it for seventy years, and still it would not reach its depth (bottom)."
The chain of this narration contains the narrator Yazid al-Raqashi, who is weak; however, the meaning of falling for seventy years with regard to the depth of Hell is also established by other authentic hadith.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الفتوح / 4598
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده ضعيف » «أخرجه مجمع الزوائد ومنبع الفوائد برقم: 18587، وأخرجه إتحاف الخيرة المهرة بزوائد المسانيد العشرة برقم: 7798/3»